用clock函数测试机器catch的作用

/*

** 测试catch的程序

*/

#include <stdio.h>

#include <string.h>

#include <time.h>

 

#define DUMBCOPY for(i = 0; i < 65536; i++) /

              destination[i] = source[i]

 

#define SMARTCOPY memcpy(destination, source, 65536)

 

int main()

{

       char source[65536], destination[65536];

       int i, j;

       clock_t m, n;

      

       m = clock();

      

       for(j = 0; j < 100; j++)

       {

              DUMBCOPY;

       }

      

       n = clock();

 

       printf("%f/n", (float)n - (float)m);

      

       return 0;

}