UVa 10195 - The Knights Of The Round Table solution

Problem link :  UVa 10195 - The Knights Of The Round Table

Solution : 


#include<stdio.h>
#include<math.h>
int main()
{
    double a,b,c,i,r;
    while(scanf("%lf %lf %lf",&a,&b,&c)==3)
    {
        if(a<=0||b<=0||c<=0)
            printf("The radius of the round table is: 0.000\n");
        else
        {
            i=(a+b+c)/2;
            r=sqrt((i-a)*(i-b)*(i-c)/i);
            printf("The radius of the round table is: %.3lf\n",r);
        }
    }
    return 0;
}