?? lab3.asm
字號:
stack segment para stack 'stack'
db 128 dup(?)
stack ends
code segment 'code'
assume ss:stack,cs:code
start:
mov ah,07h
int 21h
cmp al,7Ah
ja begin
cmp al,61h
jae zifu
cmp al,5Bh
ja begin
cmp al,41h
ja zifu
cmp al,3Ah
ja begin
cmp al,30h
jae shuzi
cmp al,20h
jae begin
cmp al,0Dh
je exit
zifu: mov dl,63h
mov ah,02h
int 21h
jmp start
shuzi:mov dl,al
mov ah,02h
int 21h
jmp start
begin:jmp start
exit: mov ah,4ch
int 21h
code ends
end start
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