在C / C算法速测仪++ [英] algorithm speed tester in C/C++

问题描述

我要我的计算算法的速度毫秒基地。在C ++ / C，我怎么能做到这一点？我需要写输入输出之前和之后的不便，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

您可以使用时钟（）函数从＆LT; time.h中＆GT; 结果
时钟（）显示有多少蜱，因为你的程序开始已经过去了。宏 CLOCKS_PER_SEC 包含每秒滴答的数量，这样你就可以真正得到时间。

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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