p7-5.c

UNIX程序设计教程

#include <time.h>
#include <stdio.h>
#include <unistd.h>
int main(void)
{
    int i;
    time_t the_time, begin_time;
    begin_time = time((time_t *)0);
    for(i=1;i<=10;i++){
        the_time = time((time_t *)0);
        printf("The time is %ld\n",the_time);
        sleep(2);
    }
    the_time = time((time_t *)0);
    printf("elapsed wall time is %lf(s)\n", difftime(the_time, begin_time));
    exit(0);
}