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);
}