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编程一、显示字符串
功能:在指定的位置,用指定的颜色,显示一个用0结束的字符串
- assume cs: code
- data segment
- db 'welcome to masm!', 0
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- data ends
- code segment
- start : mov ax, data
- mov ds, ax
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- mov dh, 8
- mov dl, 3
- mov cl, 2
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- mov si, 0
- call show_str
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- mov ax, 4c00H
- int 21H
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- show_str : push ax
- push bx
- push cx
- push dx
- push si
- push di
- mov bx, 0
- mov ax, 0b800H
- mov es, ax
- dec dh
- mov al, dh
- mov dh, 160
- mul dh
- mov bx, ax
- mov al, dl
- mov dl, 2
- mul dl
- add bx, ax
- mov ah, cl
- mov cl, 0
- show : mov al, [si]
- mov es:[bx], ax
- mov ch, [si]
- inc si
- add bx, 2
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- jcxz ok
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- jmp show
- ok: pop di
- pop si
- pop dx
- pop cx
- pop bx
- pop ax
- ret
-
- code ends
- end start
-
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编程二、决解除法溢出的问题
- assume cs: code
- code segment
- start : mov ax, 4240H
- mov dx, 000FH
- mov cx, 0AH
- call divdw
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- mov ax, 4c00H
- int 21H
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- divdw : push ax
- mov ax, dx
- mov dx, 0
- div cx
- mov bx, ax
-
- pop ax
- div cx
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- mov cx, dx
- mov dx, bx
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- ret
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- code ends
- end start
-
-
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编程三、数值显示
功能:将word型的数据变为十进制的字符串,字符串以0为结束符
- assume cs: code
- data segment
- db 10 dup (0)
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- data ends
- code segment
- start : mov ax, 12666
- mov bx, data
- mov ds, bx
- mov si, 0
- call dtoc
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- mov dh, 8
- mov dl, 3
- mov cl, 2
- call show_str
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- mov ax, 4c00H
- int 21H
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- dtoc : push ax
- push bx
- push cx
- push dx
- push si
- push di
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- mov di, 0
- d10 : mov dx, 0
- mov bx, 10
- div bx
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- add dx, 30H
- push dx
- inc di
- mov cx, ax
- jcxz d11
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- jmp d10
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- d11: mov cx, di
- d12: pop dx
- mov [si], dl
- inc si
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- loop d12
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- mov dl, 0
- mov [si], dl
-
-
-
-
- okay: pop di
- pop si
- pop dx
- pop cx
- pop bx
- pop ax
-
- ret
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- show_str:mov bx, 0
- mov ax, 0b800H
- mov es, ax
- dec dh
- mov al, dh
- mov dh, 160
- mul dh
- mov bx, ax
- mov al, dl
- mov dl, 2
- mul dl
- add bx, ax
- mov ah, cl
- mov cl, 0
- show : mov al, [si]
- mov es:[bx], ax
- mov ch, [si]
- inc si
- add bx, 2
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- jcxz ok
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- jmp show
- ok : ret
- code ends
- end start
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