# 55+ CPP Calculator Examples

This post contains a total of 55+ Hand-Picked C++ Calculator Examples. All the C++ Calculators are made purely using C++ Programming Language.

You are free to use the source codes of these C++ calculators for educational use with credits to the original owner. If you need the source code for some other work then you should contact the owner.

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## 1. By ff22ff

Made by ff22ff. Enter the operation in single line with space between the number and the operator like – 2 + 2. ( Source )

``````#include <iostream>
using namespace std;
/*Hello friend, this is a small number calculator program you need to drive by this example: "digit" space "mathematical sign" space "digit" 2 + 2          | plz like*/
int main() {
float a, b;
char k;
cin >> a >> k >> b;
switch (k){

case'+':
cout<<a<<"+"<<b<<"="<<a+b
<<endl;
break;

case'-':
cout<<a<<"-"<<b<<"="<<a-b
<<endl;
break;

case'*':
cout<<a<<"*"<<b<<"="<<a*b
<<endl;
break;

case '/':
cout<<a<<"/"<<b<<"="<<a/b
<<endl;
break;
}
cout << "plz like my code\n"<< ">>by ff22ff<<" << endl ;
return 0;
}``````

## 2. By SparkerXof

C++ Calculator by SparkerXof. Enter the operation in different lines, first enter 1st number then the 2nd number after that the operator. ( Source )

``````#include <iostream>
using namespace std;

int main() {
double var1; //Create variables
double var2;
double total;
char oper;

cout << "Print first variable: "; //Set varriables
cin >> var1;
cout << "\nPrint second variable: ";
cin >> var2;
cout << "\nPrint operator: ";
cin >> oper;

switch (oper) {
case '+':
total = var1 + var2; //Cheak operators
break;
case '-':
total = var1 - var2;
break;
case '*':
total = var1 * var2;
break;
case '/':
total = var1 / var2;
break;
default:
cout << "\nYou must write +, -, * or /." << endl;
}

cout << "\nTotal: " << total << endl; //View total

return 0;
}``````

## 3. By Kieran Lunt

Made by Kieran Lunt. Enter operation in different lines, enter first number then operator in second line and the second number in third line. ( Source )

``````#include <iostream>
using namespace std;

int main() {
int i;
string e;
int u;
cin >> i;
cin >> e;
cin >>u;
if(e == "+"){
cout << i + u << "\n";
}
if(e == "-"){
cout << i - u << "\n";
}
if(e == "*"){
cout << i * u << "\n";
}
if(e == "/"){
cout << i / u << "\n";
}
return 0;
}``````

## 4. By Abhijeet Kumar

Made by Abhijeet Kumar. In the first two lines enter two digits and in the third line enter an operator. ( Source )

``````#include <iostream>
using namespace std;
int main()
{ float op1, op2, res ;
char ch ;
cout <<"Two numbers you entered: ";
cin >> op1 >>op2 ;
cout << op1 << " , " << op2 ;
cout <<"\n"<<"The operator you entered(+, -, *, /, %) : " ;
cin >> ch;
cout << ch;
cout <<"\n";
switch (ch)
{ case '+' : res=op1+op2;
break ;
case '-' : res=op1 - op2;
break ;
case '*' : res = op1 * op2;
break ;
case '/' : if (op2 == 0)
cout <<"Divide by zero error!!!";
else
res = op2 / op1;
break ;
case '%' : if (op2 == 0)
cout <<"Divide by zero error!!!";
else
{   int r,q;
q = op2 / op1;
r = op2 - (q * op1);
res = r;
}
break ;
default : cout <<"\n"<<"Wrong operator!!!";
}
cout <<"The calculated result is :"<< res<<"\n";
}``````

## 5. By J.G

Made by J.G. To use, enter in your first number, the operator, then the second number. Operators can be +,-,*,/,%, and ^. ( Source )

``````/* Made by J.G.
Thanks to Senpai Filip for showing me how to declare variables as doubles then use them as integers later.
*/

#include <iostream>
#include <cmath>

using namespace std;

int main() {
char o;
double x, y;

cin>>x>>o>>y;

switch(o){

case '+':
cout<<x<<" + "<<y<<" = "<<x+y;
break;

case '-':
cout<<x<<" - "<<y<<" = "<<x-y;
break;

case '/':
if(y==0){
cout<<"Cannot divide by 0!";
}
else{
cout<<x<<"/"<<y<<" = "<<x/y;
}
break;

case '*':
cout<<x<<" * "<<y<<" = "<<x*y;
break;

case '%':
cout<<int(x)<<" % "<<int(y)<<" = "<<int(x) % int(y);
break;

case'^':
cout<<x<<" ^ "<<y<<" = "<<pow(x,y);
break;

default:
cout<<"Please enter a valid operation. Valid operations are +,-,*,/,%, and ^"<<endl;
break;
}

cout<<endl<<"Please leave a like and any suggestions in the comment section! Is there anything that I should add?";
return 0;
}``````

## 6. By 𝙎𝙞𝙢𝙧𝙖𝙣 💫

Made by 𝙎𝙞𝙢𝙧𝙖𝙣 💫. Enter the two numbers of the operation in one single line with space in between. ( Source )

``````    /*｡☆✼★━━━━━━━━━━★✼☆｡
𝘾𝙧𝙚𝙖𝙩𝙚𝙙 𝘽𝙮
𝙎𝙞𝙢𝙧𝙖𝙣 💫
/*
ENTER THE TWO VALUES
Ex:- 2  5
*/

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
float x, y;

cin>> x >> y;
cout<<"\n\n\n";
cout<< setw(10) << x << setw(2)
<< "+" <<setw(2) << y <<setw(2)
<< " = " <<setw(1) << x+y << endl;

cout<< setw(10) << x << setw(2)
<< "-" <<setw(2) << y <<setw(2)
<< " = " <<setw(1) << x-y << endl;

cout<< setw(10) << x << setw(2)
<< "*" <<setw(2) << y <<setw(2)
<< " = " <<setw(1) << x*y << endl;

cout<< setw(10) << x << setw(2)
<< "/" <<setw(2) << y <<setw(2)
<< " = " <<setw(1) << x/y << endl;

cout<< "\n\n\n\t Thank you for visiting 🍫🤗";
cout<<"\n\n\t ©️ Simran ";
return 0;
}``````

## 7. By Collin

Made by Collin. Enter the operation in single line with no space in between the number and the operator. ( Source )

``````#include <iostream>
using namespace std;

int main() {
int a, b;
int sum;
cout << "calculator \n";
cin >> a;
cin >> b;
sum = a + b;
cout << a;
cout << " + ";
cout << b;
cout << " = ";
cout << sum;

return 0;
}``````

## 8. By Satyam Keshri

Made by Satyam Keshri. First enter two numbers in single line with space in between, after that select the operator you want to use. ( Source )

``````#include <iostream>
using namespace std;

class calculator{
double num1, num2;
public :
calculator (double n1, double  n2){
num1 =n1;
num2 = n2;
}
void input( double n1, double n2){
num1 =n1;
num2 =n2;
}
return num1 + num2 ;
}
double sub(){
return num1 - num2 ;
}
double mult(){
return num1 * num2 ;
}
double div(){
return num1/num2;
}
};

int main() {
calculator obj(10,15);
int choice=0; // i=0;
do{
/*   cout<<"\n\n\nSelect any index of Array. (<5)\n";
cin>>i;
if(i>4)
cout<<"\nEnter a valid index";
else{*/
double num1  , num2 ;
cout<<"\nEnter two numbers : ";
cin>>num1 >>num2 ;
obj.input(num1 ,num2 );
cout<<"\nSelect an option"<<endl;
cout<<"\nADDITION -> 1\nSUBSTRACTION -> 2\nMULTIPLICATION -> 3\nDIVISION-> 4\nEXIT ->0\n";
cin>>choice;
switch(choice){
case 1 :
break;
case 2 :
cout<<"\nSubstraction of numbers = "<<obj.sub();
break;
case 3 :
cout<<"\nMultiplication of numbers = "<<obj.mult();
break;
case 4 :
cout<<"\nDivision of numbers = "<<obj.div();
case 0 :
choice=0;
break;
default :
cout<<"\nInvalid Selection\tPlease enter valid option\n";
break;
}
}
while(choice !=0);

return 0;
}``````

## 9. By Fedor Kovalenko

Made by Fedor Kovalenko. Enter the first number, mathematical operation and the second number. The space is not required. ( Source )

``````
#include <iostream>
#include <cmath>
using namespace std;

int main() {
double  number1,number2, result;
char oper;
//cout<<"Enter the number1: ";
cin>>number1;
//cout<<"Enter operation: ";
cin>>oper;
//cout<<"Enter the number2: ";
cin>>number2;
cout<<"Number1: "<<number1<<endl;
cout<<"Operation: "<<oper<<endl;
cout<<"Number2: "<<number2<<endl;
if (oper=='+') {
result=number1+number2;
}
else if (oper=='-') {
result = number1-number2 ;
}
else if (oper=='*') {
result = number1*number2 ;
}
else if (oper=='/') {
result = number1/number2;
}
else if (oper=='^') {
result = pow(number1,number2);
}
else {
cout<<endl<<"There is no such mathematical operation"<<endl;
}
cout<<endl<<number1<<oper<<number2<<" = "<<result<<endl;
}  //Thanks!``````

## 10. By Artem Kozlov

C++ Calculator by Artem Kozlov. Enter operator in single line with or without space in between. ( Source )

``````#include <iostream>

using namespace std;

int main()
{

double  a;
char b;
double  c;
double  z;
cin>>a;
cin >> b;
cin >> c;
if (b == '+'){
z = a + c;
}
if (b == '-'){
z = a - c;
}
if (b == '/'){
z = a / c;
}
if (b == '*'){
z = a*c;
}
cout << z << endl;
}``````

## 11. By The future is now thanks to science

Made by The future is now thanks to science. The program supports multiple operators and numbers. Enter the operation in one single line. ( Source )

``````#include <iostream>
using namespace std;
int main() {
//For less than or equal 100 numbers.support +,-,*,/
//hope you like it
float num;
char sym;
int i,j;
int k=0;
for(i=0;i<100;i++)
{
cin>>num[i];
cin>>sym[i];
if(sym[i]=='=')
{
break;
}

}
for(j=0;j<i;j++)
{
while(1)
{
if(sym[j]=='/')
{
k=j+1;
num[j]=num[j]/num[k];

for(;k<i;k++)
{
num[k]=num[k+1];
sym[k-1]=sym[k];
}
}
if(sym[j]!='/')
{
break;
}
else
{
continue;
}
}
}
for(j=0;j<i;j++)
{
while(1)
{
if(sym[j]=='*')
{
k=j+1;
num[j]=num[j]*num[k];

for(;k<i;k++)
{
num[k]=num[k+1];
sym[k-1]=sym[k];
}
}
if(sym[j]!='*')
{
break;
}
else
{
continue;
}
}
}

for(j=0;j<i;j++)
{
while(1)
{
if(sym[j]=='-')
{
k=j+1;
num[j]=num[j]-num[k];

for(;k<i;k++)
{
num[k]=num[k+1];
sym[k-1]=sym[k];

}
}
if(sym[j]!='-')
{
break;
}
else
{
continue;
}
}
}
for(j=0;j<i;j++)
{
while(1)
{
if(sym[j]=='+')
{
k=j+1;
num[j]=num[j]+num[k];

for(;k<i;k++)
{
num[k]=num[k+1];
sym[k-1]=sym[k];
}
}
if(sym[j]!='+')
{
break;
}
else
{
continue;
}
}
}
cout<<num;
}``````

## 12. By Demoshell

Made by Demoshell. Enter operation in single line. ( Source )

``````#include <iostream>
#include <math.h>
using namespace std;
void math(){
cout<<"Enter a math operation: ";
char op; float n1; float n2; float result;
cin>>n1;
cin>>op;
cin>>n2;
switch(op)
{
case '+':
result = n1 + n2;
break;

case '-':
result = n1 - n2;
break;

case '*':
case 'x':
result = n1 * n2;
break;
case '^':
result = pow(n1, n2);
break;
case '/':
result = n1 / n2;
break;
default:
cout<<"\nError, please try again";
};
cout<<"\nThe result is: "<<result;
}
int main() {
math();
return 0;
}``````

## 13. By Yuri Gagarin

Made by Yuri Gagarin ( Not the astronaut one ). Enter operation in single line without spaces in between operator and numbers. ( Source )

``````#include <iostream>

using namespace std;

int main()
{
double x = 0.0;
double y = 0.0;
double result = 0.0;
char oper = '+';

cout << "Calculator [C++]" << endl;
cout <<"------------------" << endl << endl;

cin  >> x  >> oper  >> y;
if (oper == '/' && y == 0)
{
cout << "Uff! An error has ocurred." << endl;

}
else
{
if(oper == '+'){
result = x + y;
}
else if(oper == '-'){
result = x - y;
}
else if(oper == '*'){
result = x * y;
}
else if(oper == '/'){
result = x / y;
}
else{
cout << "Unexpected operator" << endl;
}
}
cout << "Result is: " << result << endl;

return 0;
}``````

## 14. By Senan

Made by Senan. Input should be like this ” number operation  number”, all in different lines. ( Source )

``````#include <iostream>
using namespace std;

int main() {
double  x,y;
char c;
cin>>x; // input the first number
cin>>c; // input the operation  (+,-,*,/)
cin>>y; // input the second number
switch (c){
case '+' : cout <<x<<"+"<<y<<"="<<x+y;
break ;
case '-' : cout <<x<<"-"<<y<<"="<<x-y;
break ;
case '*' : cout <<x<<"*"<<y<<"="<<x*y;
break ;
case '/' : if(y==0){
cout <<"error:You can't divide by zero";
break ;}
else {
cout <<x<<"/"<<y<<"="<<x/y;
break ;}
default :cout <<" wrong operation :(";

}
return 0;
}``````

## 15. By Suraj Mane

C++ Calculator by Suraj Mane. Enter the two numbers of the operation in one single line with space in between, after that press enter and select the operator. ( Source )

``````// Created by Suraj Mane

//Give gaps in numbers when entering numbers.!
/*Give minimum two gaps for entering your choice & numbers!*/
//enter only three numbers..
//enter third number between  1 to 5 is compulsory!!!!!

//enter like this onr 56 57 2....

#include <iostream>
using namespace std;

int main() {

int no1,no2,result,choice;
cout<<"Enter two numbers: " <<endl;
cin>>no1>>no2;
cout<<"\nYou entered:"<<no1<<" & "<<no2 <<endl;
cin>>choice;
cout<<"\nYou choice is To "<<choice<<endl;
switch(choice)
{
case 1:result=no1+no2;
break;

case 2:result=no1-no2;
break;

case 3:result=no1*no2;
break;

case 4:result=no1/no2;
break;

case 5:result=no1%no2;
break;

default:cout<<"\n Invalid choice\n plz only choose between 1 to 5!!!"<<endl;
}
return 0;
}``````

## 16. By Hussain Ali

Made by Hussain Ali. Enter operation in single lines, enter first number then the operator and after that the second number. ( Source )

``````#include <iostream>
using namespace std;

int main(){
double a,b,c;
char d={'+','-','*','/','%'};
char od;
cout<<"Please enter the number \t";
cin>>a;
cout<<"what you want to do \t ";
cin>>od;
cout<<"Provide the 2nd Value \t";
cin>>b;
if(od==d)
c=a+b;
if(od==d)
c=a-b;
if(od==d)
c=a*b;
if(od==d)
c=a/b;
if(od==d)
c=a/b*100;
cout<<endl<<"Your result is: "<<c;

return 0;
}``````

## 17. By Eugene Shapovalov

Made by Eugene Shapovalov. Enter first number then the operator and at last the second number. ( Source )

``````#include <iostream>
using namespace std;

int main() {
float a,b,c;
char sym;
cout<<"Enter the first number \n";
cin>>a;
cout<<"Choose option \n";
cin>>sym;
cout<<"Enter the second number \n";
cin>>b;
switch (sym){
case '+':
c=a+b;
cout<<c<<endl;
break;
case '-':
c=a-b;
cout<<c<<endl;
break;
case '*':
c=a*b;
cout<<c<<endl;
break;
case '/':
c=a/b;
cout<<c<<endl;
break;
default:
cout<<"Error"<<endl;
break;}
return 0;
}``````

## 18. By ✨SARANG✨

Simple C++ Calculator by ✨SARANG✨. Enter first number then operator and after that the second number, all in different lines. ( Source )

``````#include <iostream>
using namespace std;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//enter the equation:
//input example : 5+8
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

int main()
{
int num1,num2,result,reminder;
char operation;

cin>>num1;
cin>>operation ;
cin>>num2;

switch(operation)
{
case '+':
result =num1+num2;
cout<<result;
break;

case '-':
cout<<"You choose subtraction"<<endl;
result=num1-num2;
cout<<result;
break;

case '*':
cout<<"You choose multiplication"<<endl;
result=num1*num2;
cout<<result;
break;

case '/':
cout<<"You choose division"<<endl;
result=num1/num2;
reminder=num1%num2;
cout<<"The quotient is:"<<result<<endl;
cout <<"The reminder is:"<<reminder;
break;

default :
cout<<"Invalid input pls enter valid input";
}
return 0;
}``````

## 19. By Rajan Kumar

Made by Rajan Kumar. First select the operator you want to use after that enter the two numbers. ( Source )

``````#include <iostream>
using namespace std;
void Subtraction();
void Division();
void Multiplication();
void Modulus();

int main()
{
cout<<"\n What do you want to do?\n 1. Addition.\n 2. Subtraction.\n 3. Division.\n 4. Multiplication.\n 5. Modulus.\n";
cout<<" Enter your choice : ";
char choice;
cin>>choice;
switch (choice)
{
case '1' : Addition();
break;
case '2' : Subtraction();
break;
case '3' : Division();
break;
case '4' : Multiplication();
break;
case '5' : Modulus();
break;
default  : printf("\n Enter valid option...\n");
break;
}
return 0;
}

{
float a;
float b;
cout<<"\n Enter first number  : ";
cin>>a;
cout<<"\n Enter second number : ";
cin>>b;
float c=a+b;
cout<<"\n Result is : "<<c;
}

void Subtraction()
{
float a;
float b;
cout<<"\n Enter first number  : ";
cin>>a;
cout<<"\n Enter second number : ";
cin>>b;
float c=a-b;
cout<<"\n Result is : "<<c;
}

void Division()
{
float a;
float b;
cout<<"\n Enter first number  : ";
cin>>a;
cout<<"\n Enter second number : ";
cin>>b;
float c=a/b;
cout<<"\n Result is : "<<c;
}

void Multiplication()
{
float a;
float b;
cout<<"\n Enter first number  : ";
cin>>a;
cout<<"\n Enter second number : ";
cin>>b;
float c=a*b;
cout<<"\n Result is : "<<c;
}

void Modulus()
{
int a;
int b;
cout<<"\n Enter first number  : ";
cin>>a;
cout<<"\n Enter second number : ";
cin>>b;
int c=a%b;
cout<<"\n Result is : "<<c;
}``````

## 20. By Roman Pervutinskiy

Made by Roman Pervutinskiy. Enter first number then operator, after that the second number all in different lines. ( Source )

``````/*
Example:
Input:
10
*
56
Output:
10*56=560
*/
#include <iostream>
using std::cout;
int main() {
float a,c;
char b;
std::cin >> a >> b >> c;
switch(b) {
case '+': cout << a << b << c << '=' << a+c; break;
case '-': cout << a << b << c << '=' << a-c; break;
case '*': cout << a << b << c << '=' << a*c; break;
case '/': cout << a << b << c << '=' << a/c;
}
return 0;
}``````

## 21. By Vikash Pal

Basic C++ Calculator by Vikash Pal. Input format – 23 45 3, where, 23 is a number, 45 is another number number and 3 is operation type. ( Source )

``````/*

There are 5 operations you can do.
1 for Division, 2 for Modulus, 3 for Multiplication, 4 for Addition and 5 for Substraction.

Example- 24 34 2 can be written as 24 % 34 == 24
*/

#include <iostream>

int main() {
int num1, num2, op;
std::cout << ">> Please enter a number." << std::endl;
std::cin >> num1;
std::cout << "<< You entered " << num1 << std::endl;
std::cout << ">> Please enter another number." << std::endl;
std::cin >> num2;
std::cout << "<< You entered " << num2 << std::endl;
std::cout << ">> Please select the operation you want." << std::endl;
std::cout << "** Enter 1 for Division." << std::endl;
std::cout << "** Enter 2 for Modulus." << std::endl;
std::cout << "** Enter 3 for Multiplication." << std::endl;
std::cout << "** Enter 4 for Addition." << std::endl;
std::cout << "** Enter 5 for Substraction." << std::endl;
std::cin >> op;

switch(op) {
case 1:
std::cout << "<< You selected Division." << std::endl;
std::cout << "<< And your result is " << num1/num2 << std::endl;
break;
case 2:
std::cout << "<< You selected Modulus." << std::endl;
std::cout << "<< And your result is " << num1%num2 << std::endl;
break;
case 3:
std::cout << "<< You selected Multiplication." << std::endl;
std::cout << "<< And your result is " << num1*num2 << std::endl;
break;
case 4:
std::cout << "<< You selected Addition." << std::endl;
std::cout << "<< And your result is " << num1+num2 << std::endl;
break;
case 5:
std::cout << "<< You selected Substraction." << std::endl;
std::cout << "<< And your result is " << num1-num2 << std::endl;
break;
default:
std::cout << "<< Invalid Operation." << std::endl;
}

std::cout << "\n";

std::cout << "Note: This code works best in Cxxdroid - Educational IDE for C/C++. Available at Google Play.";
return 0;
}``````

## 22. By Emi

Made by Emi. Enter the operation in one single line without spaces in between the operator and numbers. ( Source )

``````#include <iostream>
using namespace std;

int main() {
float a, b, sum, dif, prod, div;
char sign;
cout<<"Calculator:\n";
cin>>a;
cin>>sign;
if(sign == '+'){
cin>>b;
sum = a+b;
cout<<a<<'+'<<b<<'=';
cout<<sum;
}
else if (sign == '-' ){
//does the substraction
cin>>b;
dif = a-b;
cout<<a<<'-'<<b<<'=';
cout<<dif;
}
else if(sign == '*' ){
//does the multiplication
cin>>b;
prod = a*b;
cout<<a<<'*'<<b<<'=';
cout<<prod;
}
else if (sign == '/' ){
//does the division
cin>>b;
if(b == 0){
cout<<"You can't divide by 0!!!";
/*eliminates the possibility of b being zero so the program won t crash*/
}
else{
div = a/b;
cout<<a<<'/'<<b<<'=';
cout<<div;
}
}
else if(sign != '+' || sign != '-' || sign != '*' || sign != '/') {
cout<<"Error!!!!! ";
/*detects if a user inputs a letter instead of an operation
sign and displays error if it s a letter*/
}
return 0;

}``````

## 23. By alex44098

Made by alex44098. First enter the operator you want after that enter the first and the second number. ( Source )

``````#include <iostream>
using namespace std;

int main()
{

/*
subtraction -
multiplication *
division /
the area of a circle %
the circumference of a circle @
example input:
/ 6 3
or
@ 5
*/
int a;
int b;
int x=2;
double pi=3.14;
char operation;
cout<<"Enter the operation sign:"<<endl<<"addition:+"<<endl<<"subtraction:-"<<endl<<"multiplication:*"<<endl<<"division:/"<<endl<<"the area of a circle :%"<<endl<<"the circumference of a circle :@"<<endl;
cin>>operation;
switch(operation)
{
case'+':
cout<<"Enter first number:"<<endl ;
cin>>a;
cout<<"Enter second number:"<<endl ;
cin>>b;
break;
case'-':
cout<<"Enter first number:"<<endl ;
cin>>a;
cout<<"Enter second number:"<<endl ;
cin>>b;
break;
case'*':
cout<<"Enter first number:"<<endl ;
cin>>a;
cout<<"Enter second number:"<<endl ;
cin>>b;
break;
case'/':
cout<<"Enter first number:"<<endl ;
cin>>a;
cout<<"Enter second number:"<<endl ;
cin>>b;
break;
default:
cout<<"Enter circle's radius:"<<endl ;
cin>>a;
}

switch(operation)
{
case'+':
cout<<a<<"+"<<b<<"="<<a+b<<endl;
break;
case'-':
cout<<a<<"-"<<b<<"="<<a-b<<endl;
break;
case'*':
cout<<a<<"*"<<b<<"="<<a*b<<endl;
break;
case'/':
cout<<a<<"/"<<b<<"="<<a/b<<endl;
break;
case'@':
cout<<"the circumference of a circle :"<<a*pi*x<<endl;
break;
case'%':
cout<<"the area of a circle :"<<a*a*pi<<endl;
break;
default:
cout<<"ERROR!!!!!!";
}
return 0;
}``````

## 24. By Saugat Jarif

Made by Saugat Jarif. Enter first number, after that the operator and after that the second number. All in different lines. ( Source )

``````#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;

// Created By - Saugat Jarif
// Created In - C++

// Please Copy This Code To Your Code Editor Then Run it

// Example Input:
// 1
// +
// 1

// output: 2

int main()
{
// variables
int Firstnumber;
int Secondnumber;
char selector;
int sum;

// number selection
cout << "select the first number" << endl;
cin >> Firstnumber;
cout << "select an operator" << endl;
cin >> selector;
cout << "enter your second number" << endl;
cin >> Secondnumber;

// conditions

// checks if divide by 0
if (Firstnumber / Secondnumber && Firstnumber == 0 || Secondnumber == 0){
cout << "NumError: Cant Divide By 0"<< endl;
}
if(Firstnumber == 0 || Secondnumber == 0){
if(Firstnumber > Secondnumber){
cout << Firstnumber << endl;
}
if(Firstnumber < Secondnumber){
cout << Secondnumber << endl;
}
}

// Conditions to what to do
if (selector == '+') {
sum = Firstnumber + Secondnumber;
}
if (selector == '-') {
sum = Firstnumber - Secondnumber;
}
if (selector == '*') {
sum = Firstnumber * Secondnumber;
}
if (selector == '/') {
sum = Firstnumber / Secondnumber;
}
//output
cout << sum << endl;
return 0;
}``````

## 25. By Bodan Talev

Made by Bodan Talev. Your input should be something like this ->[num operator num] (example, 5+5) (example, 9~). ( Source )

``````

#include <iostream>
#include <cstdlib>
#include <cmath>

using namespace std;

int main() {
int a,b;
char x;
cin>>a>>x>>b;

switch(x) {
case '+':
cout<<a<<"+"<<b<<"="<<a+b;
break;
case '-':
cout<<a<<"-"<<b<<"="<<a-b;
break;
case '*':
cout<<a<<"*"<<b<<"="<<a*b;
break;
case '/':
cout<<a<<"/"<<b<<"="<<a/b;
break;
case '%':
cout<<a<<"%"<<b<<"="<<a%b;
break;
case '^':
cout<<pow(a,b);
break;
case '~':
cout<<"~"<<a<<"="<<sqrt(a);
break;
default: cout<<"Error!";
}
return 0;
}``````

## 26. By Garvit dubey 🇮🇳

C++ Calculator by Garvit dubey 🇮🇳. Enter first number, then second number and at last the operator. ( Source )

``````#include <iostream>
using namespace std;

int main()
{
int a , b ;
char ch ;
cout << "Enter the first number" << endl ;
cin >> a ;
cout << "First Number : " << a << endl ;
cout << "Enter the second number" << endl ;
cin >> b ;
cout << "Second Number : " << b << endl ;
cout << "Choose the operator " << endl ;
cin >> ch ;
if (ch=='+')
{
cout << "Sum is : " << a+b << endl ;
}
else if (ch=='-')
{
cout << "Difference is : " << a-b << endl ;
}
else if (ch=='*')
{
cout << "Product is : " << a*b << endl ;
}
else if (ch=='/')
{
cout << "Quotient is : " << a/b << endl ;
}
else if (ch=='%')
{
cout << "Remainder is : " << a%b << endl ;
}
else
cout << "Invalid" << endl ;
return 0;
}``````

## 27. By Vincenzinho

Made by Vincenzinho. Enter 2 numbers with a space in between, like this 10 5. ( Source )

``````

#include <iostream>
using namespace std;

int main() {

float a;
float b;
cout<<"first number: ";
cin>>a;
cout<<a<<endl;
cout<<"second number: ";
cin>>b;
cout<<b<<endl<<endl;

float sum=a+b;
float multiply=a*b;
float divide=a/b;
float divide2=b/a;
float minus=a-b;
float minus2=b-a;

cout<<a<<"+"<<b<<"="<<sum<<endl;
cout<<a<<"*"<<b<<"="<<multiply<<endl;
cout<<a<<"/"<<b<<"="<<divide;
if (b==0){cout<<"(you can't divide by 0)"<<endl;}
else {cout<<endl;}
cout<<b<<"/"<<a<<"="<<divide2;
if (a==0){cout<<"(you can't divide by 0)"<<endl;}
else {cout<<endl;}
cout<<a<<"-"<<b<<"="<<minus<<endl;
cout<<b<<"-"<<a<<"="<<minus2<<endl;

return 0;
}``````

## 28. By Mahadi

Made by Mahadi. Enter operation in one single line, like 1+1 without any space in between. ( Source )

``````#include <iostream>
using namespace std;

int main() {

float x, y, hasil;
char aritmatika;

cout << "Calculator" << endl << endl;

cout << "Input first number = ";
cin >> x;
cout << endl;

cout << "input operator : ";
cin >> aritmatika;
cout << endl;

cout << "Input second number = ";
cin >> y;
cout << endl;

switch(aritmatika){
// (+)
case '+':
hasil = x + y;
cout << x << " + " << y << " = " << hasil;
break;

// (-)
case '-':
hasil = x - y;
cout<< x <<" - " << y << " = " << hasil;
break;

// (*)
case '*':
hasil = x * y;
cout<< x <<" * " << y << " = " << hasil;
break;

// (/)
case '/':
hasil = x / y;
cout<< x <<" / " << y << " = " << hasil;
break;

default:
cout<< "You put wrong number! "<<endl;
}

return 0;
}``````

## 29. By nikoloz buava

Made by nikoloz buava. Enter two numbers to get the output of it when used with different operators. ( Source )

``````/* enter 2 whole numbers to calculate*/
#include <iostream>
using namespace std;

int main() {
int x, y;
cout << "Enter the first number: " << endl;
cin >> x;
cout << "Enter the second number: " << endl;
cin >> y;
int sum = x + y;
cout << "Sum is:" << endl;
cout << x << " + " << y << " = " << sum << endl;
int difference = x - y;
cout << "Difference is:" << endl;
cout << x << " - " << y << " = " << difference << endl;
int multiplied = x * y;
cout << "Multiplied is:" << endl;
cout << x << " * " << y << " = " << multiplied << endl;
int division = x / y;
cout << "Division is:" << endl;
cout << x << " / " << y << " = " << division << endl;
int b = x % y;
cout << "Balance obtained during division is:" << endl;
cout << x << " % " << y << " = " << b << endl;
return 0;
}``````

## 30. By Jason ramirez

Made by Jason ramirez. First select the operator after that enter the first and the second number. ( Source )

``````#include<iostream>
#include<cmath>

using namespace std;

int main()
{
//-------defining variables and initializing them-------------
double num1,num2;
char operation,redo;
//--------Printing my name on screen----------------
cout<<"Welcome to the calculator program v.1.0 written by Jason Ramirez"<<endl;
cout<<"***************************************************"<<endl;
cout<<endl<<endl<<endl;
//--here do loop is used so that the program can be used more then one time
//without exiting the run screen---------------------------
do
{
//----receiving the variables from input--------------
cout<<" Please enter an operation which you like to calculate (+,-,*,/,s)";
cout<<"[s stands for swap]:";
cin>>operation ;
cout<<endl<<endl;
cout<<" Please enter two numbers to apply your requested operation(";
cout<<operation<<"):"<<endl<<"1st num:";
cin>>num1;
cout<<"2nd num:" ;
cin>>num2;
cout<<endl;
//---used switch function so thet the operater can be decided------------
switch (operation)
{
//------calculating the requested equation for inputs-------------
//-------at the same time printing the results on screen-----------
case'+':
cout<<"The addition of two numbers ("<<num1<<","<<num2<<"):";
cout<<num1+num2<<endl;
break;
case'-':
cout<<"The substraction of two numbers ("<<num1<<","<<num2<<"):";
cout<<num1-num2<<endl;
break;
case'*':
cout<<"The multiplication of two numbers ("<<num1<<","<<num2<<"):";
cout<<num1*num2<<endl;
break;
case'/':
cout<<"The division of two numbers ("<<num1<<","<<num2<<"):";
if(num2==0)
{
cout<<"not valid"<<endl;
}
cout<<(num1/num2)<<endl;
break;
case's':
cout<<"The swap of two numbers ("<<num1<<","<<num2<<"):";
swap(num1,num2);
cout<<"1stnumber="<<num1<<"and 2nd number="<<num2<<endl<<endl;
break;
default:
cout<<"unknown command"<<endl;

}
//----now once again the program will ask the user if want to continue or not
cout<<"enter y or Y to continue:";
cin>>redo;
cout<<endl<<endl;
}
while(redo=='y'||redo=='Y');

return 0;

}``````

## 31. By Angus👑

Simple C++ Calculator by Angus👑. Enter first number then the operator, after that the second number, all in different lines. ( Source )

``````
#include <iostream>
using namespace std;

int main() {
int first_num ;
char operators ;
int second_num ;
cin>> first_num ;
cin>> operators ;
cin>> second_num ;

if (operators == '+'){
cout<< "you entered " <<first_num <<"+" <<second_num<<endl ;
cout<<"calculated = "<<first_num + second_num;
}
else if (operators == '-'){
cout<< "you entered " <<first_num <<"-" <<second_num<<endl ;
cout<<"calculated = " <<first_num - second_num;
}
else if (operators == '*'){
cout<< "you entered " <<first_num <<"*" <<second_num<<endl ;
cout<< "calculated = "<<first_num * second_num;
}
else if (operators == '/'){
cout<< "you entered " <<first_num <<"/" <<second_num<<endl ;
cout<< "calculated = "<<first_num / second_num;
}
else{
cout<<"error operation";
}
cout<<endl<<"Thank u for running my program"<<endl<<"If u liked please upvote";
return 0;

}``````

## 32. By Arash

Made by Arash. Enter input in the format 1 + 1. All in different lines. ( Source )

``````#include <iostream>
#include <math.h>
#include <string>

using namespace std;
int main(){
double a;
string b;
double c;
cin >> a >> b >> c;
if (b == "-"){
cout << a << b << c << "=" << a - c;
}
if (b == "+"){
cout << a << b << c << "=" << a + c;
}
if (b == "×"){
cout << a << b << c << "=" << a * c;
}
if (b == "%"){
cout << a << b << c << "=" << (c*a)/100;
}
if (b == "÷"){
cout << a << b << c << "=" << a/c;
}
if (b == "√"){
cout << b << a  << "=" << sqrt(a);
}
if (b == "^"){
cout << a << b << c << "=" << pow(a,c);
}
return 0;
}``````

## 33. By Piotr Wronka

Made by Piotr Wronka. Enter first number, operator then the second number. all in different lines. ( Source )

``````
#include <iostream>

using namespace std;

int main()
{

double  a;
char b;
double  c;
double  z;
cin>>a;
cin >> b;
cin >> c;
if (b == '+'){
z = a + c;
}
if (b == '-'){
z = a - c;
}
if (b == '/'){
z = a / c;
}
if (b == '*'){
z = a*c;
}
cout << z << endl;
}``````

## 34. By Denis_vitiaz55055

Made by Denis_vitiaz55055. The program supports 3 numbers and 2 operators. Enter the operation in one single line. ( Source )

``````#include <iostream>
using namespace std;

int main()
{
int firstF = 0;
double  x;
double  y;
double  z;
double  a;
double  b;
char func;
char func2;
cin>>x>>func>>y>>func2>>z;
if(func2 == '*' or func2 == '/' or func2 =='^')
{
firstF = 1;
}
else {
firstF = 0;
}
if(firstF == 0) {
switch (func) {
case '+':
a=x+y;
break;
case '-':
a=x-y;
break;
case '*':
a=x*y;
break;
case '/':
a=x/y;
break;
case '^':
for(int counter=1;counter<y;counter++)
{
x=x*x;
}
a=x;
break;
}
switch (func2) {
case '+':
b=a+z;
break;
case '-':
b=a-z;
break;
case '*':
b=a*z;
break;
case '/':
b=a/z;
break;
default:
b=a;
break;
}
}
else {
switch (func2) {
case '+':
a=y+z;
break;
case '-':
a=y-z;
break;
case '*':
a=y*z;
break;
case '/':
a=y/z;
break;
case '^':
for(int counter;counter<z;counter++)
{
y=y*y;
}
a=y;
break;
}
switch (func) {
case '+':
b=x+a;
break;
case '-':
b=x-a;
break;
case '*':
b=x*a;
break;
case '/':
b=x/a;
break;
}
}
cout<<b;
}``````

## 35. By leo Goncalves

C++ Calculator by leo Goncalves. Enter the operation in single line. ( Source )

``````
#include <iostream>
#include <math.h>
using namespace std;

int main() {

double num1;
double num2;
char op;

cin >> num1 >> op >> num2;

switch (op) {
case '+':
cout << num1 << '+' << num2 << '=' << num1 + num2;
break;

case '-':
cout << num1 << '-' << num2 << '=' << num1 - num2;
break;

case '/':
if (num2 == 0){
cout << "cannot divide by 0";
} else {
cout << num1 << '/' << num2 << '=' << num1 / num2;
}
break;

case '*':
cout << num1 << '*' << num2 << '=' << num1 * num2;
break;

case '^':
cout << num1 << '^' << num2 << '=' << pow(num1, num2 );
break;

case 'e':
cout << num1 << 'e' << num2 << '=' << num1 * pow( 10, num2 );
break;

default:
cout << "invalid operation";

}

/* trying to develop this to doing square rutes*/

return 0;
}``````

## 36. By Zarina Maturaimova

Made by Zarina Maturaimova. Enter first number and second number to get the output of the operation using different operators. ( Source )

``````// My easy calculator
#include <iostream>

using namespace std;

int main()
{
float num_1, num_2, sum, c, d;

//Calculator name
cout <<"Calculator 3000\n";

//You enter the first number
cout << "\nYour 1 number = x";
cin >> num_1;

cout << "\n";

//You enter the second number
cout << "\nYour 2 number = y ";
cin >> num_2;

cout << "\n\nYour sum: ";
sum = num_1 + num_2;
cout << num_1 << "+" << num_2 << "=" << sum;

cout << "\n\nYour division: ";
c=num_1/num_2;
cout << num_1 << "/" << num_2 << "=" << c;

cout << "\n\nYour subtraction: ";
d=num_1-num_2;
cout << num_1 << "-" << num_2 << "=" << d;

cout << "\n\nYour Multiplication: ";
c=num_1*num_2;
cout << num_1 << "*" << num_2 << "=" << c;

return 0;
}``````

## 37. By Christoph

Made by Christoph. Enter operation in different lines, first enter first number then operator then the second number. ( Source )

``````#include <iostream>
#include <string>
using namespace std;

int main() {
float a;
float b;
float ergebnis;
std::string x;
int d;
cin >> a;
cin >> x;
cin >> b;

if(x == "+"){
d = 1;
}
else if(x == "*"){
d = 2;
}
else if(x == "-"){
d = 3;
}
else if(x == "/"){
d = 4;
}

switch(d){
case 1:
ergebnis = a + b;
cout << "The result of "<< a << " + " << b << " is " << ergebnis <<".";
break;
case 2:
ergebnis = a * b;
cout << "The result of "<< a << " * " << b << " is " << ergebnis<<".";
break;
case 3:
ergebnis = a - b;
cout << "The result of "<< a << " - " << b << " is " << ergebnis<<".";
break;
case 4:
ergebnis = a / b;
cout << "The result of "<< a << " / " << b << " is " << ergebnis<<".";
break;
}

return 0;
}``````

## 38. By Prabha_I

Made by Prabha_I. Give the one input and give space and give another input (i.e;34 12). ( Source )

``````
#include <iostream>
using namespace std;
int main(){
long int a,b,d,i,sum=0;
cin>>a;
cin>>b;
d=b;
switch(1){
sum=a-(-b);
cout<<a<<"+"<<b<<"="<<sum<<endl;

case 2:
sum=0;               //for subtraction
if(a>b&&a<0&&b<0||a>0&&b>0&&a>b||a>0&&b<0){

for(i=b;i<a;i++){
sum=sum+1;
}
cout<<a<<"-"<<b<<"="<<sum<<endl;
}
else if(a<0&&b<0&&b>a||a>0&&b>0&&b>a||a<0&&b>0){
for(i=a;i<b;i++){
sum=sum+1;
}
cout <<a<<"-"<<b<<"="<<"-"<<sum<<endl;
}
else if(a=b){
cout<<a<<"-"<<b<<"="<<"0"<<endl;
}
case 3:                 //for multiplication
sum=0;
b=d;
if(a>0&&b>0||a<0&&b<0){
if(b>0){
while(b>0){
sum=a+sum;
b--;
}
cout<<a<<"*"<<d<<"="<<sum<<endl;}
else if(b<0){
while(b<0){
sum=a+sum;
b++;
}cout<<a<<"*"<<d<<"="<<-sum<<endl;
}}
else if(a<0&&b>0||a>0&&b<0){
if(b>0){ while(b>0){
sum=sum+a;
b--;
}
cout<<a<<"*"<<d<<"="<<sum<<endl;
}else if(b<0){
while(b<0){
sum=sum+a;
b++;
}cout<<a<<"*"<<d<<"="<<-sum<<endl;
}}
case 4:                        //for division
sum=0;
b=d;
if(a>b&&a>0&&b>0||b>a&&a<0&&b<0){
if(a>b){
for(i=a;i>=b;i--){
if(i%b==0){
sum=sum+1;}
}
cout<<a<<"/"<<d<<"="<<sum<<endl;}
else if(b>a){
for(i=-a;i>=-b;i--){
if(i%b==0){
sum=sum+1;
}
}cout<<a<<"/"<<b<<"="<<sum<<endl;

}}
else if(a>0&&b<0&&a>-b||a<0&&b>0&&-a>b){
if(a>-b){
for(i=a;i>=-b;i--){
if(i%b==0){
sum=sum+1;
}
}cout<<a<<"/"<<b<<"="<<-sum<<endl;}
else if(-a>b){
for(i=-a;i>=b;i--){
if(i%b==0){
sum=sum+1;
}
}cout<<a<<"/"<<b<<"="<<-sum<<endl;
}
}
else if(a>0&&b>0&&a<b||a<0&&b<0&&a>b||a>0&&b<0&&a<-b||a<0&&b>0&&-a<b){
cout<<a<<"/"<<b<<"="<<"0"<<endl;
}
}cout<<endl<<"If any wrong answers....please comment ...."<<endl<<endl<<"only integers";
return 0;
}``````

## 39. By Baraa AB

C++ Calculator by Baraa AB. Enter the operation in one single line, first the operator then the two numbers, give space between operator and numbers. ( Source )

``````
# include <iostream>
using namespace std;

int main()
{
char op;
float num1, num2;

cout << "Enter operator either + or - or * or /: ";
cin >> op;

cout << "Enter two operands: ";
cin >> num1 >> num2;

switch(op)
{
case '+':
cout << num1+num2;
break;

case '-':
cout << num1-num2;
break;

case '*':
cout << num1*num2;
break;

case '/':
cout << num1/num2;
break;

default:
// If the operator is other than +, -, * or /, error message is shown
cout << "Error! operator is not correct";
break;
}

return 0;
}``````

## 40. By STRIKER

Made by STRIKER. Input example 5*2 or 9/5 or 2,6*8and so on use coma instead of decimal point. ( Source )

``````
#include <iostream>
#include <string>
#include <cstdlib>
#include <cmath>
using namespace std;

float add (float x, float y){
return x+y;
}
float sub (float x, float y){
return x-y;
}
float mul (float x, float y){
return x*y;
}
float div (float x, float y){
return x/y;
}
float con(string s){
float n=0; int q=0;
for (int i=0; i<s.length(); i++){
if (int(s[i])==44){
q=s.length()-i; q--; continue;
}
n=n*10+(int(s[i])-48); }
n/=pow(10,q);
return n;
}
int main(){
float x,y;
int k,index;
string s,sf,ss;
cin>>s;
sf=""; ss="";
for (int i=0; i<s.length(); i++){
if (int(s[i])==42 || int(s[i])==43 || int(s[i])==45 || int(s[i])==47){
index=i; k=int(s[i]);}
}
for (int i=0; i<index; i++){
sf+=s[i];
}
for (int i=index+1; i<s.length(); i++){
ss+=s[i];
}
x=con(sf);
y=con(ss);
switch(k){
case 42: cout<<s<<"="<<mul(x,y); break;
case 43: cout<<s<<"="<<add(x,y); break;
case 45: cout<<s<<"="<<sub(x,y); break;
case 47: cout<<s<<"="<<div(x,y); break;
}
return 0;
}``````

## 41. By Param

Made by Param. Enter the two numbers of the operation in one single line without the operator and with spaces in between the numbers. ( Source )

``````#include <iostream>
using namespace std;

int main() {
int a,b;
cout<<"calculator 1.0"<<endl;
cout<<"----------------"<<endl;
cin>>a>>b;
cout<<"sum of "<<a <<" and "<<b<<" is "<<a+b<<endl;
cout << "subtraction is "<<a-b<<endl;
cout << "multication is "<<a*b<<endl;
try {
if(b==0) throw 0;
cout << "divison is "<< (float)a/b<<endl;
}
catch (...)
{
cout <<"divide by zero error" <<endl;
}
return 0;
}``````

## 42. By Yamin Mansuri

Made by Yamin Mansuri. Enter the operation in one single line without spaces in between the numbers and operator. ( Source )

``````#include <iostream>

using namespace std;

int main() {

float x , y ;

char z ;

cin >> x ;

cin >> z ;

cin >> y ;

switch (z) {

case '+' :

cout << x << '+' << y << '=' << x+y ;

break ;

case '-' :

cout << x << '-' << y << '=' << x-y ;

break ;

case '*' :

cout << x << '*' << y << '=' << x*y ;
break ;

case '/' : if ( y == 0) {

cout << "error" ;

}

else {

cout << x << '/' << y << '=' << x/y ;}
}

return 0;
}``````

## 43. By Hrishikesh Kulkarni

C++ Calculator by Hrishikesh Kulkarni. Enter your input in this way first enter Integer1 then Integer2  after that 1. If addition  2. If Difference  3. If multiplication. ( Source )

``````
#include<iostream>
using namespace std;
int main()
{
int  a,b,c;
char ch;
cout << "SIMPLE CALCULATOR\n";
cout << "\n Enter Two Integers \n:";
cin >> a ;
cin >> b ;
cout << "\nSelect your choice :";
cout << "+.Addition \n - .Difference";
cout << "\n *.Multipication";
cin >> ch ;
cout << "\n";
switch (ch)
{
case '+': c=a+b;
cout << c;
break;
case '-': c=a-b;
cout << c;
break;
case '*': c=a*b;
cout << c;
break;
default : cout << "Invalid Choice";
}
return 0;
}``````

## 44. By Time yyyf

Made by Time yyyf. Enter operation in single line without spaces. ( Source )

``````#include <iostream>
using namespace std;
#include <math.h>
int main() {
char  x;
double a;
double b;
cin >> a;
cin >> x;
cin >> b;
switch (x){
case '+':
cout <<a<<'+'<<b<<'='<< a+b;
break;
case '-':
cout <<a<<'-'<<b<<'='<< a-b;
break;
case '/':
cout <<a<<'/'<<b<<'='<< a/b;
break;
case '*':
cout <<a<<'*'<<b<<'='<< a*b;
break;
}

return 0;
}``````

## 45. By Artashes

Made by Artashes. Enter operation in single line without any spaces in between operator and number. ( Source )

``````#include <iostream>
using namespace std;

int main()
{
int a,b;
char x;
cin >> a >> x >> b;
switch (x) {
case '+':
cout << a + b;
break;
case '-':
cout << a - b;
break;
case '*':
cout << a * b;
break;
case '/':
if (b == 0){
cout << "Error";
break;
}
cout << a / b;
break;
default:
cout << "ERROR!";
}

return 0;
}``````

## 46. By Frost

Made by Frost. Enter 2 no’s and also your choice at the first time only, each separated by space or on new lines, and check the output. ( Source )

```Enter two nos: 5 5
Enter your choice: 1
2.Subtract
3.Multiply
4.Divide
5.Modulus

``````#include <iostream>
using namespace std;

int main() {

int a,b,c,choice;

cout<<"Enter two nos:\n";
cin>>a>>b;

cin>>choice;

switch(choice){

case 1:
c=a+b;
break;

case 2:
c=a-b;
cout<<"Subtraction is:"<<c<<endl;
break;

case 3:
c=a*b;
cout<<"Multiplication is:"<<c<<endl;
break;

case 4:
c=a/b;
cout<<"Division is:"<<c<<endl;
break;

case 5:
c=a%b;
cout<<"Modulus is:"<<c<<endl;
break;

default:
cout<<"Invalid choice!";
}
return 0;
}``````

## 47. By Andrew

Made by Andrew. ( Source )

```Enter number X
Enter second number Y
X = 10
Y = 10
=============
2.Substraction
3.Multiplication
4.Division
Choice  = 3
Quotient=100```
``````#include <iostream>
#include <stdio.h>
#include <cstdlib>
using namespace std;
float x,y;
int choice;

int main() {

cout <<"Enter number X "<<endl;
cin>>x;
cout <<"Enter second number Y "<<endl;
cin>>y;
cout<<"X = "<<x<<endl;
cout<<"Y = "<<y<<endl;

cout<<"============="<<endl;
cout<<"2.Substraction "<<endl;
cout<<"3.Multiplication"<<endl;
cout<<"4.Division"<<endl;

cin>>choice;
cout<<"Choice  = "<<choice<<endl;

switch (choice)
{ case 1 :
cout<<"Sum="<<x+y;
break;
case 2 :
cout<<"Odds ="<<x-y;
break;
case 3 :
cout <<"Quotient="<<x*y;
break ;
case 4 :
if(y==0)
cout<<"Do not divide by zero"<<endl;
else cout <<"ratio = "<<x/y;
break;

}

return 0;
}``````

## 48. By Marouane Krizi

Made by Marouane Krizi. ( Source )

```3+2
5
try again please ```
``````#include <iostream>
using namespace std ;
int main()
{
int first_number ;
int second_number ;
cin >> first_number ;
cin >> second_number ;
cout << first_number + second_number  << endl ;
cout << " try again please " ;
return 0 ;
cout << first_number * second_number << endl ;
cout << " try again please " ;
return 0 ;
cout << first_number - second_number << endl ;
cout << " try again please " ;
return 0 ;

}``````

## 49. By salman

Made by salman. ( Source )

```Options :
Enter 'add' to add two numbers :
Enter 'sub' to sub two numbers :
Enter 'mul' to mul two numbers :
Enter 'div' to div two numbers :
Enter 'quit' to quit the calculator :
Enter the first number : 20
Enter another number : 20
```
``````#include <iostream>
#include <cstring>
using namespace std;
int main(){
float a,b,c;
char i;
do{     cout<<"Options : \n";
cout<<"Enter 'add' to add two numbers : \n";
cout<<"Enter 'sub' to sub two numbers : \n";
cout<<"Enter 'mul' to mul two numbers : \n";
cout<<"Enter 'div' to div two numbers : \n";
cout<<"Enter 'quit' to quit the calculator : \n";
cin>>i;
if (i == 'q') {
break;         }
else if (i == 'a'){
cout<<"Enter the first number : \n";
cin>>a;
cout<<"Enter another number : \n";
cin>>b;
c = a + b;         cout<<"Answer after addition : "<<c<<"\n\n";         }
else if (i=='s'){
cout<<"Enter the first number : \n";
cin>>a;
cout<<"Enter another number : \n";
cin>>b;
c = a - b;
cout<<"Answer after subtraction : "<<c<<"\n\n";         }
else if (i=='m'){
cout<<"Enter the first number : \n";
cin>>a;
cout<<"Enter another number : \n";
cin>>b;
c = a * b;
cout<<"Answer after multiplication : "<<c<<"\n\n";         }
else if (i=='d'){
cout<<"Enter the first number : \n";
cin>>a;
cout<<"Enter another number : \n";
cin>>b;
c = a / b;
cout<<"Answer after division : "<<c<<"\n\n";         }
else {
cout<<"Invalid input : \n\n";
}
}while(true);
return 0;
}          ``````

## 50. By XXXMATRIXXXX

Made by XXXMATRIXXXX. Enter number operator then number to get the output. ( Source )

```4+4
4 + 4 = 8```
``````#include <iostream>
#include <cmath>
#include <cfloat>

using namespace std;

cout<<" _._._._._._._._._._._._._._._._._._._\n|      Welcome to my Calculator!      |\n|Here are some instructions:          | \n";
cout<<"|  1)Enter first number, then the     |\n|     operation and second number     |";
cout<<"\n|  2)Operation can be:                |\n|      (+,-,*,/,^ and %)              |\n";
cout<<"|  3)Enjoy!                           |\n";
cout<<"|_._._._._._._._._._._._._._._._._._._|\n\n";
}

void calculator(double num1, char operation, double num2) {
switch(operation) {
case('+'):
if((num1+num2)<=DBL_MAX || (num1+num2)>=DBL_MIN) {
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<num1+num2<<"\n\n";
break;
} else {
cout<<"Overflow occured! Try again.\n";
break;
}
case('-'):
if((num1-num2)<=DBL_MAX || (num1-num2)>=DBL_MIN) {
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<num1-num2<<"\n\n";
break;
} else {
cout<<"Overflow occured! Try again.\n";
break;
}
case('*'):
if((num1*num2)<=DBL_MAX || (num1*num2)>=DBL_MIN) {
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<num1*num2<<"\n\n";
break;
} else {
cout<<"Overflow occured! Try again.\n";
break;
}

case('/'):
if(num2!=0)
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<num1/num2<<"\n\n";
else
cout<<"Error! Division by 0 is not 8defined."<<"\n\n";
break;
case('^'):
if(pow(num1, num2)<=DBL_MAX) {
if(num1==0 && num2==0) {
cout<<num1<<" ^ "<<num2<<"\nAnswer in C++ is 1, but it is not mathematicaly defined.\n";
break;
}
else {
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<pow(num1, num2)<<"\n\n";
break;
}
} else {
cout<<"Overflow occured! Try again.\n";
break;
}
case('%'):
cout<<num1<<" "<<operation<<" "<<num2<<" = "<<(int)num1%(int)num2<<"\n\n";
break;
default:
cout<<"You entered wrong operation, try again."<<"\n\n";
break;
}

}

int main() {
double num1, num2;
char operation;
cin>>num1>>operation>>num2;
calculator(num1, operation, num2);

return 0;
}``````

## 51. By Ashfiya Mumtaz Hassan

Made by Ashfiya Mumtaz Hassan. Program to perform various arithmetic operations using switch statement. 3 inputs required in the following format: operand operator operand Eg.1 + 2 for operations involving 3 operands. To find the square root of a number, type in an operand and s and to find the cube root of a number type in an operand and c. ( Source )

```Enter the expression: 7+7
Result = 14```
``````#include <iostream>
#include <math.h>
using namespace std;
int main()
{
float num1, num2, result=0;
char optr;

cout<<"Enter the expression:"<<endl;
cin>>num1>>optr>>num2;
switch(optr)
{
case '+':  result=num1+num2;
break;
case '-':  result=num1-num2;
break;
case '*':  result=num1*num2;
break;
case '/':  result=num1/num2;
break;
case '%':  result=(int)num1%(int)num2;
break;
case '^':  result=pow(num1, num2);
break;
case '>': result=(num1>num2);
break;
case '<': result=(num1<num2);
break;
case 's': result=sqrt(num1);
break;
case 'c': result=cbrt(num1);
break;
default: cout<<"Invalid operation"<<endl;
}
cout<<"Result = "<<result<<endl;

return 0;
}``````

## 52. By ConfiG

Made by ConfiG. ( Source )

```Calculator v0.5 by ConfiG
1+1
1+1=2```
``````#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main()
{
int A;
int B;
int result;
char math;
srand(time(0));
cout << "Calculator v0.5 by ConfiG" << endl;
cin >> A >> math >> B;
switch (math) {
case '+':
result = A + B;
cout << A << "+" << B << "=" << result << endl;
break;
case '-':
result = A - B;
cout << A << "-" << B << "=" << result << endl;
break;
case '*':
result = A * B;
cout << A << "*" << B << "=" << result << endl;
break;
case '/':
result = A / B;
cout << A << "/" << B << "=" << result << "(" << A % B << ")" << endl;
break;
case '?':
cout << "Your random number from " << A << "to" << B << ": " << (rand()%(B-A+1))+A << endl;
break;
default:
cout << "Error!" << endl;
break;
}
return 0;
}``````

## 53. By Shimon

Made by Shimon. ( Source )

``````10+10
20``````
``````#include <iostream>
using namespace std;

int main() {
double a;
double b;
char c;
cin >> a;
cin >> c;
cin >> b;
switch(c){
case '+': {
cout << a + b << endl;
}
break;
case '-': {
cout << a - b << endl;
}
break;
case '/': {
cout << a / b << endl;
}
break;
case '*': {
cout << a * b << endl;
}
break;
default:
cout << "Unknown operator" << endl;
}
return 0;
}``````

## 54. By Redi Marku

Made by Redi Marku. Just put in the input numbers and operator that you want to calculate. Example (3+8) or (7*7) etc. ( Source )

```3+1
3+1=4

Try again```
``````#include <iostream>
using namespace std;

int main() {

int a, b;
char op,re;

cin>>a;
cin>>op;
cin>>b;

do{
switch (op){

case'+':
cout<<a<<"+"<<b<<"="<<a+b
<<endl;
break;

case'-':
cout<<a<<"-"<<b<<"="<<a-b
<<endl;
break;

case'*':
cout<<a<<"*"<<b<<"="<<a*b
<<endl;
break;

case '/':
cout<<a<<"/"<<b<<"="<<a/b
<<endl;
break;

default :
cout<<"Your input is not correct, try to calculate something (example. 7+3)."
<<endl;

}
cout<<endl;
cout<<"Try again";
cin>>re;
cout<<endl;

}while(re=='y');

return 0;
}``````

## 55. By Red Ender

Made by Red Ender. ( Source )

```1
+
1
2```
``````#include <iostream>
using namespace std;

int main ()
{
int a;
string  number;
int b;
cin>> a;
cin>> number ;
cin>> b;
if(number =="+") {
cout<< a + b;}
if (number =="-") {
cout<< a - b;}
if (number =="*") {
cout<< a * b;
}
if (number =="/") {
if (b==0) {
cout<< "zero error 666 "<<endl;
int i=0;
while (i<=362) {
cout<< "error "<<endl;
i++;
}
}
else {
cout<< a/b;}
}
if (number =="%") {
cout<< a%b;
}
if (true) {
if (number == "/%") {
double  p=a;
double r=b;
cout<< p/r;}
}
if (number =="**") {
int z=1;
int n=a;
while (z<b)
{
a=a*n;
z++;
}
cout<<a;
}

return 0;
}``````

## 56. By Kuchiki

Made by Kuchiki. ( Source )

```1+2
resulatat3```
``````#include <iostream>
#include <math.h>
#include <stdlib.h>
using namespace std;
int addition(int a,int b)
{int result1=(a+b);
return result1;}

int souss(int a,int b)
{int result2=(a-b);
return result2;}

int multi(int a,int b)
{int result3=(a*b);
return result3;}

int dev(int a,int b)
{int result4=(a/b);
return result4;}

main()
{
int a;
char c;
int b;
int result1,result2,result3,result4;
loop:
cout<<" "  <<" "   << " "<< endl;
cin>>a;
cin>>c;
cin>>b;

result2= souss(a,b);
result3= multi(a,b);
result4= dev(a,b);

switch (c)
{
case '+' :
cout<<" resulatat"<<result1<<endl;
break;
case '-':
cout<<" resulatat"<<result2<<endl;
break;
case '*':
cout<<" resulatat"<<result3<<endl;
break;
case '/' :
cout<<" resulatat"<<result4<<endl;
break;
default :
cout<<" errrrrr"<<endl;
}

goto loop;

system("pause");
return 0;
}``````