汇编语言将字符串中小写字母转为大写

代码解释如下：

;问题:将字符串中的小写字母转换为大写assume cs:codedata segment	db 'I Like Coding use Assembly Language',0data endsstack segment	db 128 dup(0)stack endscode segmentstart:			mov ax,data				mov ds,ax				mov ax,0B800H				mov es,ax				mov ax,stack				mov ss,ax				mov sp,128				call init_data				call show_str				mov ax,4c00h				int 21h;============================================================init_data:		mov si,0				mov di,160*10 + 64				mov cx,10				ret;============================================================show_str:		mov dl,ds:[si]				cmp dl,0			;下面这两句代码不能写到cmp dl,'a'的后面				je showStrRet				cmp dl,'a'				jb next				cmp dl,'z'				ja next				and dl,11011111B	;andl操作将该字符转为大写next:			mov es:[di],dl				inc si				add di,2				jmp show_str				showStrRet:		ret;============================================================				code endsend start