.MODEL SMALL
.STACK 100H
.DATA
PROMPT_1 DB 'Enter the First digit : $'
PROMPT_2 DB 'Enter the Second digit : $'
PROMPT_3 DB 'Sum of First and Second digit : $'
VALUE_1 DB ?
VALUE_2 DB ?
.CODE
MAIN PROC
MOV AX, @DATA ; initialize DS
MOV DS, AX
LEA DX, PROMPT_1 ; load and display the PROMPT_1
MOV AH, 9
INT 21H
MOV AH, 1 ; read a character
INT 21H
SUB AL, 30H ; save First digit in VALUE_1 in ASCII code
MOV VALUE_1,AL
MOV AH, 2 ; carriage return
MOV DL, 0DH
INT 21H
MOV DL, 0AH ; line feed
INT 21H
LEA DX, PROMPT_2 ; load and display the PROMPT_2
MOV AH, 9
INT 21H
MOV AH, 1 ; read a character
INT 21H
SUB AL, 30H ; save Second digit in VALUE_2 in ASCII code
MOV VALUE_2,AL
MOV AH, 2 ; carriage return
MOV DL, 0DH
INT 21H
MOV DL, 0AH ; line feed
INT 21H
LEA DX, PROMPT_3 ; load and display the PROMPT_3
MOV AH, 9
INT 21H
MOV AL, VALUE_1 ; add First and Second digit
ADD AL, VALUE_2
ADD AL, 30H ; convert ASCII to DECIMAL code
MOV AH, 2 ; display the character
MOV DL, AL
INT 21H
MOV AH, 4CH ; return control to DOS
INT 21H
MAIN ENDP
END MAIN
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