I have created a "c programming" but am unable to run it.

I am very new for c programming. I have created a simple programming...
#include <stdio.h>
int main()
{
           int p,n;
           float r,si;

           p=1000;
           n=3;
           r=8.5;

           si=p*n*r/100;

           printf("%f\n",si);
           return 0;
}

Now I want to run this but the problem is how ! Please tell me the commands which should be entered .