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;

printf("Enter the radius of a circlen");
scanf ("%f", &radius);

area = PI * pow (radius,2);

printf ("Area of a circle = %5.2fn", area);
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