大小寫轉換

 data segment quit db "your put wrong num press any key to exit......",13,10,'$' data ends extra segment max db 'z' min db 'a' extra ends code segment assume cs:code,ds:data,es:extra start: input: mov ax,data mov ds,ax mov ax,extra mov es,ax mov ah,01h int 21h lea di,min scas min jb exit ja judgez exit: mov ah,9 lea dx,quit int 21h judgez: lea di,max scas max ja exit jb amend amend: sub al,20h mov dx,ax mov ah,2h int 21h mov ah,4ch int 21h code ends end start