#include<time.h>
#include<stdio.h>
#include<stdlib.h>
#include<windows.h>
int main()
{
//精确到秒 ==========================================
time_t t1,t2;
time(&t1);
//此处放置要测试的代码
Sleep(1000);//延时
time(&t2);
printf("%d %d %d秒\n",t1,t2,t2-t1);
//精确到毫秒 ========================================
clock_t c1,c2;
c1=clock();
//此处放置要测试的代码
Sleep(100);//延时
c2=clock();
printf("%d %d %d毫秒\n",c1,c2,c2-c1);
//精确到 0.000001毫秒 ===============================
LARGE_INTEGER litmp;
LONGLONG start, end;
double dft, dff, dfm;
QueryPerformanceFrequency(&litmp);//获得时钟频率
dff = (double) litmp.QuadPart;
QueryPerformanceCounter(&litmp);//获得初始值
start = litmp.QuadPart;
//此处放置要测试的代码
Sleep(1000);//延时
QueryPerformanceCounter(&litmp);//获得终止值
end = litmp.QuadPart;
dfm = (double) (end - start);
dft = dfm / dff;//获得对应的时间值,单位秒
printf("%lf毫秒\n",dfm/dff*1000);
}
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