assume cs:code, ss:stack
data segment
db 'word', 0
db 'unix', 0
db 'wind', 0
db 'good', 0
data ends
stack segment
dw 0,0,0,0,0,0,0,0
stack ends
code segment
start: mov ax, stack
mov ss, ax
mov sp, 16
mov ax, data
mov ds, ax
mov bx, 0
mov cx, 4
s:push cx
mov si, bx
call capital
add bx, 5
pop cx
loop s
mov ax, 4C00H
int 21H
capital:mov cl, [si] ;把ds:[si]中存的数据给cl
mov ch, 0
jcxz ok ;当cx为0时跳转,也就是一个字符串结尾时跳转
and byte ptr [si], 11011111B
inc si
jmp short capital
ok:ret
code ends
end start
用call、ret指令实现将以0结尾的c字符串转大写
猜你喜欢
转载自blog.csdn.net/qq_43071318/article/details/105426319
今日推荐
周排行