代碼解釋如下：

;問題:將字符串中的小寫字母轉(zhuǎn)換為大寫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			;下面這兩句代碼不能寫到cmp dl,'a'的后面				je showStrRet				cmp dl,'a'				jb next				cmp dl,'z'				ja next				and dl,11011111B	;andl操作將該字符轉(zhuǎn)為大寫next:			mov es:[di],dl				inc si				add di,2				jmp show_str				showStrRet:		ret;============================================================				code endsend start