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计算程序执行所需的时间：

clock_t clock( void );

clock_t start,finish;

#include 
   
    #include 
    
     #include 
     
      void sleep( clock_t wait );void main( void ){   long    i = 600000L;   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() )      ;}
     
    
   

Delay for three secondsDone!Time to do 600000 empty loops is 0.1 seconds

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