/**
    Theme: Compute Time of Execution
    compiler: Dev C++ 4.9.9.2
    Date: 99/10/27
    Author: ShengWen
    Blog: https://cg2010studio.wordpress.com/
*/
#include<iostream>
#include<iomanip>
#include<windows.h>
using namespace std;
int main()
{
    LARGE_INTEGER startTime,endTime,fre;
    double times;
    QueryPerformanceFrequency(&fre); //取得CPU頻率
    QueryPerformanceCounter(&startTime); //取得開機到現在經過幾個CPU Cycle
    
    //doing something
    
    for(int i=0;i<1000000000;i++);
    //doing something
    
    
    QueryPerformanceCounter(&endTime); //取得開機到程式執行完成經過幾個CPU Cycle
    times=((double)endTime.QuadPart-(double)startTime.QuadPart)/fre.QuadPart;
    //cout << fixed << setprecision(20) << times << 's' << endl;
    printf("所需時間: %3.2f 秒\n",times); 
    system("pause");
    return 0;
}