C++中测试程序运行时间的几种方法总结

#include <iostream>
#include <windows.h>
using namespace std;

int main()
{
	DWORD star_time = GetTickCount();
	//此处需要注意如果数值太小则检测不出来
	for (int i = 0; i < 100000000; i++)
	{
		i++;
	}
	DWORD end_time = GetTickCount();
	cout << "这个程序运行时间为：" << (end_time - star_time) << "ms." << endl;
	system("pause");
	return 0;
}

 clock_t clock();//# define long clock_t

    //#define CLK_TCK  CLOCKS_PER_SEC
     //# define CLOCKS_PER_SEC 1000

# include<iostream>
# include<ctime>
using namespace std;

clock_t  Begin, End;
double duration;
//typedef long clock_t
# define N 10000

void fun1(int);
void fun2(int);
int main()
{
	Begin = clock();//开始计时
					//====================这里写要测试的代码===================
	fun1(100);
	//=========================================================
	End = clock();//结束计时
	duration = double(End - Begin) / CLK_TCK;//duration就是运行函数所打的
											 //点数,CLK_TCK是每秒所打点数
	cout << "tick=" << double(End - Begin) << endl;
	cout << "duration=" << duration << endl;
	system("pause");
	return 0;
}

void fun1(int n)//普通输出
{
	for (int i = 0; i <= n; i++)
		cout << i << endl;
}

void fun2(int n)//递归
{
	if (n)
	{
		fun2(n - 1);
		cout << n << endl;
	}
	else cout << 0 << endl;
}

#include <boost/timer.hpp>
using namespace boost;
int main()
{
    timer t;
    cout << t.elapsed_max() / 3600 << "h" << endl;
    cout << t.elapsed_min() << "s" <<endl;
    cout << t.elapsed()<< "s" << endl;
}

#include<windows.h>  
#include<iostream>  
using namespace std;
int main()
{
	double time = 0;
	double counts = 0;
	LARGE_INTEGER nFreq;
	LARGE_INTEGER nBeginTime;
	LARGE_INTEGER nEndTime;
	QueryPerformanceFrequency(&nFreq);
	QueryPerformanceCounter(&nBeginTime);//开始计时  
	for (int i = 0; i<99999; i++)
	{
		counts++;
	}
	QueryPerformanceCounter(&nEndTime);//停止计时  
	time = (double)(nEndTime.QuadPart - nBeginTime.QuadPart) / (double)nFreq.QuadPart;//计算程序执行时间单位为s  
	cout << "程序执行时间：" << time * 1000 << "ms" << endl;
	system("pause");
	return 0;
}