Find Circumference of circle in C++

Find Circumference of Circle Program in C++

In below C++ program, we will calculate circumference and area of circle given radius of the circle. The area of circle is the amount of two-dimensional space taken up by a circle. We can calculate the area of a circle if you know its radius. Area of circle is measured in square units.

Circumference of circle is the length of the curved line which defines the boundary of a circle. The perimeter of a circle is called the circumference.

Circumference or Circle = PI X Diameter

Where, Where PI is a constant which is equal to 22/7 or 3.141(approx)

#include<iostream.h>
#include<conio.h>
#define PI 3.141

void main()
{
 float radius, circumference;
 clrscr();
 cout<<"Enter radius of circle\n";
 cin>>radius;
 // Circumference of Circle = 2 X PI x Radius
 circumference = 2*PI*radius;
 cout<<"Circumference of circle: "<<circumference;
      
getch();
}

Enter radius of circle: 3
Circumference of circle: 18.84