一、使用clock()函式，獲取毫秒級(ms)時間[1]

#include <time.h>//clock()標頭檔案

time_t start = clock();

  {statement section}//測試程式碼段

time_t end = clock();

printf("the running time is:%fs\n", double(end -start)/CLOCKS_PER_SEC); //秒

二、基於CPU級的方法，獲取微秒級(us)時間[2,3]

#include<windows.h>

#include<stdio.h>

LARGE_INTEGERR nFreq;

LARGE_INTEGER t1;

LARGE_INTEGER t2;

double dt;

QueryPerformanceFrequency(&nFreq);

QueryPerformanceCounter(&t1);

 {statementsection}//測試程式碼段

QueryPerformanceCounter(&t2);

dt =(t2.QuadPart -t1.QuadPart)/(double)nFreq.QuadPart;

cout<<"Running time:"<<dt*1000<<"ms"<<endl;//dt結果乘以1000,將顯示時間調整到ms級別顯示，乘以1000000，將顯示時間調整到us級別顯示

備註：可以在程式碼段新增Sleep()函式測試，如下兩個測試例項。

例1：500ms，ms級時間獲取

#include <time.h>//clock()標頭檔案

time_t start = clock();

  Sleep(500);//500ms

time_t end = clock();

printf("the running time is:%fms\n", double(end -start));

 執行結果，如下：

the running time is :501.000000ms

例2: 5ms測試,us時間獲取

#include<windows.h>// QueryPerformanceFrequency,QueryPerformanceCounter標頭檔案

#include<stdio.h>

LARGE_INTEGER  nFreq,t1,t2;

double dt;

QueryPerformanceFrequency(&nFreq);

QueryPerformanceCounter(&t1);

Sleep(5);//5ms,其中1ms=1000us

QueryPerformanceCounter(&t2);

 dt =(t2.QuadPart - t1.QuadPart)/(double)nFreq.QuadPart;

cout<<"Running time :"<<dt*1000000<<"us"<<endl;

 執行結果，如下：

Running time : 5162.22us

參考：

[1] http://blog.sina.com.cn/s/blog_71a211bf0101mugn.html

[2] http://blog.sina.com.cn/s/blog_9700e68d0100wfh4.html

[3] http://www.cppblog.com/deane/articles/113151.html