#include<stdio.h>
int?main()
{?char?c;
scanf("%c",&c); if(c>='a'?&&?c<='z')c+='A'-'a' printf("%c\n",c) return?0;}
int?main()?{char?c;printf("輸入壹個字母:");scanf("%c",?&c);if('a'<=c?&&?c<='z'){c?+=?32;printf("大寫字母是:%c",?c);}else?if('A'<=c?&&?c<='Z'){printf("妳輸入的已經是大寫字母了:%c",?c);}else{printf("妳輸入的不是字母!\n");}return?0;}