.MODEL SMALL
.STACK 1000
.DATA
MSGA DB 13,10,"Input first number: ","$"
MSGB DB 13,10,"Input second number:","$"
MSGC DB 13,10,"The sum is: ","$"
NUM1 db ?
NUM2 db ?
NUM3 db ?
.CODE
MAIN PROC NEAR
MOV AX, @DATA
MOV DS, AX
; get first number
LEA DX, MSGA
MOV AH, 09h
INT 21h
MOV AH, 01
INT 21H
SUB AL, '0'
MOV BL, AL
MOV AH, 01
INT 21H
SUB AL, '0'
MOV CL, AL
; get second number
LEA DX, MSGB
MOV AH, 09h
INT 21h
MOV AH, 01
INT 21H
SUB AL, '0'
MOV DL, AL
MOV AH, 01
INT 21H
SUB AL, '0'
MOV DH, AL
; add
ADD CL, DH
ADC BL, DL
MOV NUM1, CL
ADD NUM1, '0'
MOV NUM2, BL
ADD NUM2, '0'
; output sum
LEA DX, MSGC
MOV AH, 09h
INT 21h
MOV DL, NUM2
MOV AH, 02H
INT 21h
MOV DL, NUM1
MOV AH, 02H
INT 21h
MOV AH, 4Ch
INT 21h
MAIN ENDP
END MAIN
以上是我在汇编中添加 2 个两位数的代码。我想知道为什么ADC不起作用。如果添加时个位数未获得进位,则我的代码有效。但并非如此。我是否误解了 ADC 的真正作用?我应该如何处理我的代码?