Test our timer function
/* Beginning C, Third Edition By Ivor Horton ISBN: 1-59059-253-0 Published: Apr 2004 Publisher: apress */ #include <stdio.h> #include <time.h> void main() { long count = 100000000; /* Number of loop iterations */ long i = 0; /* Loop counter */ time_t calendar = 0; /* Holds calendar time */ clock_t now = 0; /* Holds initial clock time */ int interval = 3; /* Seconds interval for o/p */ int elapsed = 0; /* Elapsed clock time secs. */ calendar = time(NULL); /* Get current calendar time */ now = clock(); /* Get current clock time */ printf("Initial clock time = %d Initial calendar time = %d\n", now, calendar); for(i = 0L ; i<count ; i++) { elapsed = (clock()-now)/CLOCKS_PER_SEC; if(elapsed>=interval) { interval += 3; printf("\nElapsed = %ld seconds iterations = %ld", elapsed, i); } } printf("\nCPU time for %ld interations is %.2lf seconds\n", count, (double)(clock()-now)/CLOCKS_PER_SEC ); printf("\Final clock time = %d Final calendar time = %d\n", clock(), time(NULL)); printf("\nElapsed calendar time to execute the program is %lf\n", difftime(time(NULL), calendar)); }
1. | Display a software timer |