效率测试函数代码

// ConsoleApplication8.cpp : 定义控制台应用程序的入口点。
//


#include "stdafx.h"
#include<windows.h>


int _tmain(int argc, _TCHAR* argv[])
{
//1.获取当前cpu的频率
LARGE_INTEGER stcFrequency;
QueryPerformanceFrequency(&stcFrequency);
//2.获取其实的时钟周期
LARGE_INTEGER stcStartTime;
QueryPerformanceCounter(&stcStartTime);
for (UINT64 i = 0; i < 10000000;i++)
{
argc++;
}
//3.获取结束时钟周期
LARGE_INTEGER stcEndTime;
QueryPerformanceCounter(&stcEndTime);
//4.计算时钟周期差值
LARGE_INTEGER stcTime;
stcTime.QuadPart = stcEndTime.QuadPart - stcStartTime.QuadPart;
//5.换算经过的微妙数（1s=1000000um）当然1s=10的9次方纳秒；
stcTime.QuadPart *= 1000000000;
stcTime.QuadPart /= stcFrequency.QuadPart;



return 0;
}