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#include “stdio.h”
#include “stdlib.h”
#include “time.h”
int main( void )
{
    long     i = 10000000L;
    clock_t start, finish;
    double   duration;
    /* ²âÁ¿Ò»¸öʼþ³ÖÐøµÄʱ¼ä*/
    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\n", duration );
    system("pause");
}
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Time to do 10000000 empty loops is 0.03000 seconds
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