Window系统下C/C++程序毫秒级和微秒级执行时间获取方法

一、使用clock()函数，获取毫秒级时间[1]

#include <time.h>

time_t start = clock();

   {statement section}//测试代码段

time_t end = clock();

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

二、基于cpu级的方法，获取微妙级时间[2,3]

large_integer nfreq;

large_integer t1;

large_integer t2;

double dt;

 queryperformancefrequency(&nfreq);
 queryperformancecounter(&t1);

      {statementsection}//测试代码段
  queryperformancecounter(&t2);
  dt = （t2.quadpart - t1.quadpart） / (double)nfreq.quadpart;
  cout<<"running time :"<<dt<<"ms"<<endl;