我哪错了
#include<stdio.h>void main()
{
char ch;
scanf("%c",&ch);
if(ch>='A'&&ch<='Z')
{
ch=+32;
printf("%ch\n",ch);
}
else
if(ch>='a'&&ch<='z')
{
ch=-32;
printf("%ch\n",ch);
}
else
if(ch>=48&&ch<=57)
{
printf("%x\n",ch);
}
else
printf("control key\n");
}
