Sep 30, 2011

C program to find the area of a circle, given the radius

C program to find the area of a circle, given the radius. This is the simple C program to find the area of the circle, Here we define the PI value as macros, because it is constant through out the program. Read more about C Programming Language .

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#include <stdio.h>
#include <conio.h>
#include <math.h>
#define PI 3.142

void main()
{
 float radius, area;
 clrscr();

 printf("Enter the radius of a circle\n");
 scanf ("%f", &radius);

 area = PI * pow (radius,2);

 printf ("Area of a circle = %5.2f\n", area);
}
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