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发表于 2012-5-26 22:36:58
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assume cs:codesg,ss:stacksg,ds:datasg
stacksg segment
dw 0,0,0,0,0,0,0,0
stacksg ends
datasg segment
db '1. display '
db '2. brows '
db '3. replase '
db '4. modify '
datasg ends
codesg segment
start: mov ax,datasg
mov ds,ax
mov bx,0
mov ax,stacksg
mov ss,ax
mov sp,16
mov cx,4
s: push cx
mov si,3
mov cx,4
abc: mov al,[bx+si]
and al ,11011111b
mov [bx+si],al
inc si
loop abc
add bx,10h
pop cx
loop s
mov ax,4c00h
int 21h
codesg ends
end start
你错在
db '2. brows ' ,这里你多定义了几个字节,所以在后面的都错了,改正一下就可以把前面的都4个小写字母都转换为大写了,你试一下吧
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