[vikky@server estimator]$ 
[vikky@server estimator]$ cat test.c 
#include <stdio.h>
#include <time.h>

int main(){

        clock_t time1,time2;
        int i;
        for(i=0;i<100;i++){
        }
        time1 = 0;
        time2 = clock();
        if(time1 == time2)printf("Crazy monkey !!\n");


        return 0;
}
[vikky@server estimator]$ gcc test.c -Wall
[vikky@server estimator]$ ./a.out 
Crazy monkey !!
[vikky@server estimator]$