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#2
sjyf2005-10-26 21:03
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;input a capital letter change it opposite one data segment mess db ' please input: ''$' data ends ;----------------------------- code segment assume cs:code,ds:data ;---------------------- start: push cs sub ax, ax push ax
;--------------------------- mov ax, data mov ds, ax ;--------------------------- again: lea dx, mess ;ouput message mov ah, 09 int 21h mov ah, 01 ;input int 21h cmp al, 30h ;if input 0 exit je exit cmp al, 61h ;judge the letter jb next ;the input is't a capital sub al, 20h next: mov dl, al mov ah, 2 int 21h jmp again ;move in circles
exit: ret
code ends end start