Window系統下C/C++程序毫秒級和微秒級執行時間獲取方法

一、使用clock()函數，獲取毫秒級時間[1]

#include <time.h>

time_t start = clock();

   {statement section}//測試代碼段

time_t end = clock();

printf("the running time is :%f\n", double(end -begin)/CLOCKS_PER_SEC)

二、基於CPU級的方法，獲取微妙級時間[2,3]

LARGE_INTEGER nFreq;

LARGE_INTEGER t1;

LARGE_INTEGER t2;

double dt;

 QueryPerformanceFrequency(&nFreq);
 QueryPerformanceCounter(&t1);

      {statementsection}//測試代碼段
  QueryPerformanceCounter(&t2);
  dt = （t2.QuadPart - t1.QuadPart） / (double)nFreq.QuadPart;
  cout<<"Running time :"<<dt<<"ms"<<endl;