#include "stdio.h"
main()
{int c;
while((c=getchar())!='\n')
{switch(c-50)
{ case 0:
case 1:putchar(c+4);
case 2:putchar(c+4);break;
case 3:putchar(c+3);
default:putchar(c+2);break;
}
}
printf("\n");
}
switch(c-50)
改为switch (c-'2')
printf 上去掉一个{