C Program To Find Area of a Circle

PROGRAM :

#include<stdio.h>

#define pie 3.14 

int  main()

{

    float r,a;

    printf("Enter the Radius of a circle \n");

    scanf("%f",&r);

    a = pie*r*r;

    printf("\nArea of circle having Radius(%.2f) is %.2f",r,a);

} 

#include<stdio.h>#define pie 3.14 int main() { float r,a; printf("Enter the Radius of a circle \n"); scanf("%f",&r); a = pie*r*r; printf("\nArea of circle having Radius(%.2f) is %.2f",r,a); }

OUTPUT :

Enter the Radius of a circle

3

Area of circle having Radius(3.00) is 28.26