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Difftime

Item Value Header filetime.h Declarationdouble difftime(time_t time2, time_t time1); Returnreturns the difference, in seconds, between time1 and time2( time2 - time1). #include <time.h>   #include <stdio.h>   int main(void)   {     time_t start, end;     volatile long unsigned t;     start = time(NULL);     for(t=0; t<500; t++) ;     end = time(NULL);     printf("Loop used %f seconds.\n", difftime(end, start));     return 0;   } Loop used 0.000000 seconds.