让C程序暂停一秒

ghosTM55 posted @ 2008年11月22日 01:57 in C/C++ , 8608 阅读

　　在C语言中，time.h头文件中包含了clock()函数，它负责返回程序开始运行后的时间，以时钟周期为单位。同时，在time.h中定义了CLOCKS_PER_SEC的常量，即1秒的时钟周期数。利用这两个特性，可以实现C语言中的程序暂停1秒的功能。

#include<stdio.h>
#include<time.h>
int main(void)
{
int now=clock();
printf("%d\n",now); /* 显示0 */
for(;clock()-now<CLOCKS_PER_SEC;);
printf("1\n"); /* 一秒后显示1 */
now=clock();
for(;clock()-now<CLOCKS_PER_SEC;);
printf("2\n"); /* 再过一秒后显示2 */
return 0;
}

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