如何让用户选择是否要继续使用该程序？如果用户不使用，将显示"Thankyou for using"？

Question

.MODEL SMALL
.STACK 100
.DATA
prompt1 DB 10,15,'ENTER ANY WORDS : $'
prompt2 DB 10,15,'LENGTH OF THE WORDS IS : $'
prompt3 DB 10,15,'REVERSE OF YOUR ENTERED WORDS IS : $'     
PROMPT DB "Do you want to continue using(y/n)?$"
ERROR DB "Please enter y or n only.$"
INPUT DB ?
NEWLINE DB 0AH,0DH,"$"
EXIT DB 'Thankyou for using ! Please come back next time!'
P LABEL BYTE
M1 DB 0FFH
L1 DB ?
P3 DB 0FFH DUP ('$')
P4 DB 0FFH DUP ('$')
DISPLAY MACRO MSG
MOV AH,9
LEA DX,MSG
INT 21H
ENDM   
.CODE
MAIN PROC
MOV AX,@DATA
MOV DS,AX                
DISPLAY prompt1
LEA DX,P
MOV AH,0AH    
INT 21H
DISPLAY prompt2
MOV DL,L1
ADD DL,30H
MOV AH,2
INT 21H
DISPLAY prompt3
LEA SI,P3
LEA DI,P4
MOV DL,L1
DEC DL
MOV DH,0
ADD SI,DX
MOV CL,L1
MOV CH,0
;----- Reverse the strings
REVERSE:
MOV AL,[SI]
MOV [DI],AL
INC DI
DEC SI
LOOP REVERSE
DISPLAY P4
LEA SI,P3
LEA DI,P4   
MOV CL,L1
MOV CH,0
MOV AH,4CH
INT 21H

REPEAT:
MOV AH,09H
LEA DX,NEWLINE
INT 21H
MOV AH,09H
LEA DX,PROMPT
INT 21H
;-------------GET USER INPUT
MOV AH,01H
INT 21H
MOV INPUT,AL
CMP AL,"y"
JZ DISPLAY1
CMP AL,"n"
JE TERMINATE
JNE ERRORMSG
DISPLAY1:
MOV AH,09H
LEA DX,NEWLINE
INT 21H
ADD prompt1,1
MOV AH,02H
MOV DL,prompt1
INT 21H
JMP REPEAT
ERRORMSG:
MOV AH,09H
LEA DX,ERROR
INT 21H
JMP REPEAT
TERMINATE:
MOV AH,4CH
LEA DX,EXIT
INT 21H
MAIN ENDP
END MAIN

Answer 1

您的问题所涉及的问题很容易解决。

TERMINATE:
MOV AH,4CH
LEA DX,EXIT
INT 21H

上面的片段试图同时做两件事。显示关闭消息并终止程序。你需要在这里使用两个不同的DOS调用：

TERMINATE:
lea dx, EXIT
mov ah, 09h    ; DOS.PrintString
int 21h
mov ax, 4C00h  ; DOS.Terminate
int 21h

下面的消息需要$-终止符才能被DOS接受。

EXIT DB 'Thankyou for using ! Please come back next time!'

---

prompt1 DB 10,15,'ENTER ANY WORDS : $'
prompt2 DB 10,15,'LENGTH OF THE WORDS IS : $'
prompt3 DB 10,15,'REVERSE OF YOUR ENTERED WORDS IS : $'

这些数字15不应该变成13，回车的ASCII码吗？