HOW TO WRITE AREA OF CIRCLE PROGRAM IN C?

THE FOLLOWING PROGRAM EXPLAINS ABOUT AREA OF CIRCLE:

#include<stdio.h>

#include<conio.h>

void main()

float a,r; //to get accurate results.

clrscr();

printf("Enter the radius of circle\n");

scanf("%f",&r);

a=3.14*r*r;

printf("Area of circle=%f",a);

getch();

}

IN OUR NEXT POST I WILL EXPLAIN ABOUT AREA OF TRIANGLE.