汇编语言练习7.9

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;datasg段的每个单词的前4个单词变成大写


assume cs:codesg,ss:stacksg,ds:datasg

;栈段
stacksg segment
	dw 0,0,0,0,0,0,0,0
stacksg ends
;数据段
datasg segment
	db '1. display      '
	db '2. brows        '
	db '3. replace      '
	db '4. modify       '
datasg ends

;代码段
codesg segment

start:
	
	mov ax, stacksg
	mov ss, ax
	mov sp, 16
	
	mov ax, datasg
	mov ds, ax
	mov bx, 0
	
	mov cx, 4
	
s0:
	push cx
	mov si, 3
	
	mov cx, 4
s:
	mov al, [bx+si]
	and al, 11011111b
	mov [bx+si], al
	inc si
	loop s
	
	add bx, 16
	pop cx
	loop s0
	
	mov ax,4c00h
	int 21H
	
codesg ends
end start