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

#include <stdio.h>
int main( )
{
    char a[]="1234567",*cp1,*cp2,s;
    cp1=a;cp2=a+6;

    printf("%d\n",*cp2);  //*cp2='7'，它的ASCII码是55

    while(cp1<cp2)
    {
    s=*cp1++;
    *cp1=*cp2--;
    *cp2=s;
     }

    printf("%s",a);
}

#include ＜stdio.h＞
          main( )
        { char a[ ]="1234567",*cp1,*cp2,s;   //你定义的是char类型
          cp1=a;cp2=a+6;
          printf("%d\n",*cp2);               //输出的是%d类型，，，所以会转换成ASCII码
         while(cp1<cp2)
        {s=*cp1++;*cp1=*cp2--;*cp2=s;}
         printf("%s",a);}