现有程序 #include ＜stdio.h＞
          main( )
        { char a[ ]="1234567",*cp1,*cp2,s;
          cp1=a;cp2=a+6;
          printf("%d\n",*cp2);
         while(cp1<cp2)
        {s=*cp1++;*cp1=*cp2--;*cp2=s;}
         printf("%s",a);}
为什么输出结果为 55
                 1711717