C语言实现毫秒级定时

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main( void )
{
    long i = 10000000L;
    clock_t start, finish;
    double duration;
    /* 测量一个事件持续的时间*/
    printf( "Time to do %ld empty loops is ", i );
    start = clock();
    while( i-- )
    finish = clock();
    duration = (double)(finish - start) / CLOCKS_PER_SEC;
    printf( "%f seconds/n", duration );
    system("pause");
}

程序执行结果：

Time to do 10000000 empty loops is 0.421000 seconds
请按任意键继续...

 

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