uri online judge problem 1002 solution c programming

UIR online judge problem 1001 solution c            
 programming

code : 

#include<stdio.h>
int main()
{
    double R,pi,A;
    pi=3.14159;
    scanf("%lf",&R);
    A=pi*R*R;
    printf("A=%.4lf\n",A);
    return 0;
}



output :