计算一段程序的运行时间

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include<windows.h>

#include using namespace std ;
int main( void )
{
LARGE_INTEGER BegainTime ;
LARGE_INTEGER EndTime ;
LARGE_INTEGER Frequency ;
QueryPerformanceFrequency(&Frequency);
QueryPerformanceCounter(&BegainTime) ;
.....................
QueryPerformanceCounter(&EndTime);
return((double)(EndTime.QuadPart-BegainTime .QuadPart)/Frequency.QuadPart);//就是两次的时间差

}

 

 

 

#include <windows.h>

#pragma comment(lib,"winmm.lib")
int main( void )
{

 DWORD dwStart = timeGetTime();
 ..................
 DWORD dwEnd  = timeGetTime();

 printf("%f/n",(double)(dwEnd-dwStart));

 return 0;
}