//获取比较准确是程序运行时间
#include<iostream>
#include<windows.h>
using namespace std;
int main(void)
{
system("color F0");
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(10);
//获取时钟频率
LARGE_INTEGER m_liPerfFreq={0};
QueryPerformanceFrequency(&m_liPerfFreq);
//获取初始计数
LARGE_INTEGER m_liPerfStart={0};
QueryPerformanceCounter(&m_liPerfStart);
//测试代码的位置
for(int ix=0;ix<100000;ix++){
cout<<" ";
}
//获取最后计数
LARGE_INTEGER liPerfNow={0};
QueryPerformanceCounter(&liPerfNow);
//计算时间
long long time=( ((liPerfNow.QuadPart - m_liPerfStart.QuadPart) * 1000)/m_liPerfFreq.QuadPart);
cout<<time<<endl;
system("pause");
return 0;
}
c++实现精确计时
原文：http://blog.csdn.net/u013467442/article/details/41146385
