gistfile1.c

#include<stdio.h>
#include<time.h>

int main(){
   time_t now, then;

   time(&now);
   int i;
   for(i = 0; i < 1000000; i++){
      // do nothing?
   }
   time(&then);

   double secs = difftime(now, then);

   printf("%d milliseconds passed\n", secs);

   return 0;
}