7+ CPP Programs to Calculate Area of a Circle

This post contains a total of 7+ CPP Program Examples with Source Code to Calculate the Area of a Circle. All these Circle Area Calculator programs are made using C++ Language.

You can use the source code of these examples with credits to the original owner.

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CPP Programs to Calculate Area of Circle

1. By Ali kh

Made by Ali kh. Simple Program to calculate area of a circle. Source

10
Area= 314
Environment= 62.8
#include <iostream>
using namespace std;
int main() {
const float pi=3.14;
float r,s,p;
cin >> r;
s=pi*r*r;
p=2*pi*r;
cout << "Area= " << s <<"\n" << "Environment= " << p;
return 0;
}

2. By chandraprakash

Made by chandraprakash. C++ Program to calculate area of circle using Classes and Objects. Source

enter the radius 5
area of a circle : 78.5
#include <iostream>
using namespace std;

class area
{
  public :
  int r; 
  void getdata()
  {cout<<"enter the radius"; 
   cin>>r; 
   }
   void putdata()
   {cout<<"\n area of a circle : "<<3.14*r*r; 
   }
   };
   int main()
   {area A;
   A. getdata();
   A. putdata(); 
   return 0; 
   }
;

3. By Atul Singh

Made by Atul Singh. Source

Enter radius of CIRCLE 10
Area of Circle is
314
#include <iostream>
using namespace std;
float area(int);
int main() 
{
    int r;
    cout<<"Enter radius of CIRCLE";
    cin>>r;
    cout<<endl<<"Area of Circle is"<<endl<<area(r);
    return 0;
    }
    float area(int r)
    {return(3.14*r*r);
    }
    

4. By DESHIK P

Made by DESHIK P. Program to get the Area and Circumference of a Number. Source

6
Area of circle=113.04
Circumference of circle=37.68
#include <iostream>
const float pi=3.14;
inline float area(int r)
{return(pi*r*r);}
inline float circum(int r)
{return(2*pi*r);}
using namespace std;
int main() {
int r;
cin>>r;
cout<<"Area of circle="<<area(r)<<endl;
cout<<"Circumference of circle="<<circum(r);
    return 0;
}

5. By Tichi

Made by Tichi. You have to enter the radius of the circle in “double r=” to get its area. Source

62.8318
#include <iostream>
#define PI 3.14159
#define NEWLINE '\n'
using namespace std;

int main() {
double  r=10;
double  circle;
circle =2*PI*r
;cout <<circle;
cout <<NEWLINE;'\n';
    return 0;
}

6. By Varun

Made by Varun. Source

15
Area of circle is 706.5
#include <iostream>
using namespace std;

int main() {

   double  pi = 3.14;
   int r;
   double area;
   cin>> r;
   
   //to find area of circle
   
   area = pi * r*r;
   
   cout<<"Area of circle is "<< area << endl;


    return 0;
}

7. By Disha Daravatkar

Made by Disha Daravatkar. Source

radius of circle=20
area of circle=62.8
circumfarence of circle=125.6
#include <iostream>
using namespace std;

int main() {
float a,b,c;

cin>>a;

cout<<"radius of circle="<<a<<endl;
c=3.14*a;
cout<<"area of circle="<<c<<endl;
 
 b=2*3.14*a;
 cout<<"circumfarence of circle="<<b;
    return 0;
}

8. By Medo Myrtle

Made by Medo Myrtle. Program to find the area and circumference of any circle. Source

Enter the radius of the circle
20

The area of the circle with radius = 20 is :
 1256
Circumferance of the circle is :
 125.6
#include <iostream>
using namespace std;

int main() {


    #define area(r) 3.14 * r * r;
    #define circum(r) 2 * 3.14 * r;
    
    float rad;
    
    cout<< "Enter the radius of the circle\n \n";
    
    cin>> rad;
    
    cout <<"The area of the circle with radius = "<<rad <<" is :\n "<<area(rad);
    
    cout << "\n\nCircumferance of the circle is :\n "<< circum(rad);
    
}