#include <stdio.h>
   void main()
   {   int a = 0, i;
    for (i=1; i<5; i++)
       switch (i)
       {
 
             case 0:
             case 1:
             case 2: a += 3;break;
             case 3: a += 2;break;
        
             default: a += 5;
       }
    }
       printf(“%d\n”, d);
   }

还是错的……