#include 
     
      #include 
      
       #include 
       
        int main( void ) {    long     i = 10000000L;    clock_t start, finish;    double   duration;        printf( "Time to do %ld empty loops is ", i );    start = clock();    while( i-- )       ;    finish = clock();    duration = (double)(finish - start) / CLOCKS_PER_SEC;    printf( "%f seconds", duration );    system("pause"); }