计算程序运行时间的函数clock()

最后，来看一下MSDN上的例子及其执行结果：

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

void sleep( clock_t wait );

int main( void )
{
   long    i = 60000000L;
   clock_t start, finish;
   double  duration;

   // Delay for a specified time.
   printf( "Delay for three seconds\n" );
   sleep( (clock_t)3 * CLOCKS_PER_SEC );
   printf( "Done!\n" );

   // Measure the duration of an event.
   printf( "Time to do %ld empty loops is ", i );
   start = clock();
   while( i-- ) ;
   finish = clock();
   duration = (double)(finish - start) / CLOCKS_PER_SEC;
   printf( "%2.1f seconds\n", duration );
}

// Pauses for a specified number of milliseconds.
void sleep( clock_t wait )
{
   clock_t goal;
   goal = wait + clock();
   while( goal > clock() );
}

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计算程序运行时间的函数clock()

原文：http://blog.csdn.net/walkerkalr/article/details/20630195