算法速度测试程序在C / C ++ [英] algorithm speed tester in C/C++

问题描述

我必须计算我的算法的速度，以毫秒为单位。在C ++ / C，我怎么能这样做？我需要写入smth之前输入和输出后，但究竟是什么？

I have to calculate speed of my algorithm in base of milliseconds. In C++/C , how can i do this? I need to write smth before input and after output but what exactly??

推荐答案

您可以使用 clock（） c>< time.h>

clock（）显示自您的程序启动以来， CLOCKS_PER_SEC 包含每秒钟的滴答数，因此您可以真正得到时间。

You could use clock() function from <time.h>
clock() shows how many ticks have passed since your program started. The macro CLOCKS_PER_SEC contains the number of ticks per second, so you can actually get time.

//We start measuring here. Remember what was the amount of ticks in the 
//beginning of the part of code you want to test:
int start = clock();
//<...>
//Do your stuff here
//<...>
int end = clock();//Now check what amount of ticks we have now. 
//To get the time, just subtract start from end, and divide by CLOCKS_PER_SEC.
std::cout << "it took " << end - start << "ticks, or " << ((float)end - start)/CLOCKS_PER_SEC << "seconds." << std::endl;

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