assembly 如何在汇编代码中换行用户打印的字符串？

pokxtpni 于 2022-11-13 发布在其他

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我尝试在每个while_loop后换行。例如，我输入“cat”，它会输出“catcatcatcatcat...”而不是“cat/ncat/n...”，就像在python中一样。我被困在这里了。如果你能给我指出正确的路径或方法，那将是一件很愉快的事情。提前感谢。
我尝试插入的代码：

MOV dl, 10
MOV ah, 02h
INT 21h
MOV dl, 13
MOV ah, 02h
INT 21h

代码：

.model small
.stack 100h
.data
buff db  26        ;MAX NUMBER OF CHARACTERS ALLOWED (25).
     db  ?         ;NUMBER OF CHARACTERS ENTERED BY USER.
     db  26 dup(0) ;CHARACTERS ENTERED BY USER.
.code
main:
mov ax, @data
mov ds, ax              

;CAPTURE STRING FROM KEYBOARD.                                    
mov ah, 0Ah ;SERVICE TO CAPTURE STRING FROM KEYBOARD.
mov dx, offset buff
int 21h
                     

;CHANGE CHR(13) BY '$'.
mov si, offset buff + 1 ;NUMBER OF CHARACTERS ENTERED.
mov cl, [ si ] ;MOVE LENGTH TO CL.
mov ch, 0      ;CLEAR CH TO USE CX. 
inc cx ;TO REACH CHR(13).
add si, cx ;NOW SI POINTS TO CHR(13).
mov al, '$'
mov [ si ], al ;REPLACE CHR(13) BY '$'.
                     

;DISPLAY STRING.                   
mov ah, 9 ;SERVICE TO DISPLAY STRING.
mov dx, offset buff + 2 ;MUST END WITH '$'.
int 21h

;LOOPING 10x
mov cx, 11
while_:
dec cx
jz end_while
mov ah, 9
int 21h
jmp while_
end_while:
exit:
mov ah, 4ch
int 21h

end main

assembly

来源：https://stackoverflow.com/questions/73935245/how-to-newline-the-printed-string-from-the-user-in-assembly-code

2条答案

按热度按时间

ljo96ir51#

你没有告诉你的程序，你希望在每个 while_ 循环后都有一个新的行。当你输入字符串dog时，在buff的内存中包含1A 03 64 6F 67 0D 00 00，在你的操作后它是1A 03 64 6F 67 24 00 00。
新的一行是DOS由CR+LF提供，buff应该像1A 03 64 6F 67 0D 0A 24。

;CHANGE CHR(13) BY '$'.
mov si, buff + 1  ;NUMBER OF CHARACTERS ENTERED.
mov cl, [ si ]    ;MOVE LENGTH TO CL.
mov ch, 0         ;CLEAR CH TO USE CX. 
inc cx            ;TO REACH CHR(13).
add si, cx        ;NOW SI POINTS TO CHR(13).

; Insert the following four lines here:
INC SI          ; To reach CHR(10).
MOV AL,10       ; LineFeed character
MOV [SI],AL     ; Store LF after CR.
INC SI          ; To reach '$' terminator.

mov al, '$'
mov [ si ], al  ; Append CHR(10) BY '$'.
;DISPLAY STRING.

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sczxawaw2#

你的代码很烂，只是在前面插入了MOV dl, 10 MOV ah, 02h INT 21h MOV dl, 13 MOV ah, 02h INT 21h;从键盘捕获字符串.稍后谢谢我

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