实验11
本帖最后由 avatar10010 于 2014-10-4 17:57 编辑;初学汇编希望给点意见assume cs:code
code segment
words db "Beginner's All-purpose Symbolic Instruction Code."
start:
xor si,0
call letterc
mov ax,4c00h
int 21h
letterc:
push si
begin:
cmp byte ptr words,0
je return1
cmp byte ptr words,'a'
jb return2
cmp byte ptr words,'z'
ja return2
and byte ptr words,11011111b
return2:
inc si
loop begin
return1:
pop si
ret
code ends
end start
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