C language uppercase and lowercase letters conversion

Kerugaki-Blog Park http://www.cnblogs.com/kailugaji/

Method 1:

1#include <stdio.h>2#include <stdlib.h>3 //uppercase and lowercase letters separated by 32 digits4 voidMain () {5     Charch,t;6printf"Please input a letter:\n");7Ch=GetChar ();8T=getchar ();//Absorbing Enter9 Ten      while((ch<'A'&& ch>'Z') || (ch<'Z'&& ch>'a')){ Oneprintf"input Error!\nplease input again:\n"); ACh=GetChar (); -     } -  the     if(Ch & +) -Ch=ch &223;//make fifth bit 0, capitalize -     ElseCh=ch | +;//make fifth bit 1, lowercase -  + Putchar (CH); -printf"\ n"); +}

Method 2:

1#include <stdio.h>2#include <stdlib.h>3 //uppercase and lowercase letters separated by 32 digits4 voidMain () {5     Charch;6printf"Please input a letter:\n");7scanf"%c",&ch);8Ch= (ch>='A'&& ch<='Z')? (ch+ +):((ch>='a'&& ch<='Z')? (ch- +):p rintf ("Input error!"));9printf"%c\n", ch);Ten}

The result is:

C language uppercase and lowercase letters conversion