Question

我是装配新手，也是我使用DOSBox

我试图以大写字母打印用户输入的小写字母的字母顺序前后字母。（例如，如果用户输入B，则会打印D和.MODEL SMALL .STACK 100H .DATA MSG1 DB "Enter a letter between a and z:$" MSG2 DB "The previous letter is:$" MSG3 DB "The next letter is:$" X DB ? .CODE MAIN PROC ; initialize DS MOV AX, @DATA MOV DS, AX ; print MSG1 LEA DX, MSG1 MOV AH, 9h INT 21H ; read lowercase letter MOV AH,1h INT 21H ; save the letter X MOV X, AL ; printing new line MOV DL, 10 MOV AH, 02h INT 21h MOV DL, 13 MOV AH, 02h INT 21h ; print MSG2 MOV AH, 9h LEA DX, MSG2 INT 21H ; The previous letter MOV DL, X SUB DL, 1 ADD DL, 48 MOV AH, 2h INT 21H ; print MSG3 MOV AH, 9h LEA DX, MSG3 INT 21H ; The previous letter MOV DL, X ADD DL, 1 ADD DL, 48 MOV AH, 2h INT 21H ; DOS exit MOV AH, 4CH INT 21H MAIN ENDP END MAIN）

但我的代码打印出奇怪的样本。

我的代码：

{{1}}

Answer 1

您可以执行以下操作看：

.MODEL SMALL
.STACK 100H
.DATA
MSG1 DB 0DH,0AH,'Enter a lowerCase letter between a and z :$'
MSG2 DB 0DH,0AH,'Tht previous letter is :$'
MSG3 DB 0DH,0AH,'The next letter is:$'
.CODE
MAIN PROC
MOV AX,@DATA
MOV DS,AX
LEA DX,MSG1 
MOV AH,9 
INT 21H 
MOV AH,1 
INT 21H 
LEA DX,MSG2 
MOV AH,9 
INT 21H 
MOV AH,2 
SUB AL,20H 
SUB AL,1H
MOV BL,AL 
MOV DL,BL 
INT 21H
LEA DX,MSG3
MOV AH,9
INT 21H
MOV AH,2
ADD AL,2H
MOV DL,AL
INT 21H
MOV AH,4CH
INT 21H
MAIN ENDP
END MAIN

大写的下一个和上一个字符

1 个答案: