【MASM】大写字母转小写程序

include io32.inc
.data

.code
start:
		call readc		;读字符
		cmp al,'A'	
		jb done			;小于(below)A结束
		cmp al,'Z'
		ja done			;大于(above)Z结束
		or al,20H		;大写转小写
		call dispcrlf	;显示
		call dispc
done:	exit 0
end start

• 样例1
  – 输入：G
  – 输出：g
• 样例2
  – 输入：7
  – 输出：(无)