Question

NASM - Create a program that adds two binary numbers and returns the result in binary.

Answer 1

SOLUTION:

this is a program that prompts the user to enter two binary numbers of up to 8 digits each, and print their sum on the next line in binary. If the user enters an illegal character, he or she should be prompted to begin again. Each input ends with a carriage return.

.MODEL SMALL
.STACK 100H

.DATA
PROMPT_1 DB 0DH,0AH,'Enter the first binary number ( max 8-digits ) : $'
PROMPT_2 DB 0DH,0AH,'Enter the second binary number ( max 8-digits ) : $'
PROMPT_3 DB 0DH,0AH,'The SUM of given binary numbers in binary form is : $'
ILLEGAL DB 0DH,0AH,'Illegal character. Try again.$'

.CODE
MAIN PROC
MOV AX, @DATA ; initialize DS
MOV DS, AX

@START_2: ; jump label
XOR BX, BX ; clear BX

LEA DX, PROMPT_1 ; load and display the string PROMPT_1
MOV AH, 9
INT 21H

MOV CX, 8 ; initialize loop counter
MOV AH, 1 ; set input function

@LOOP_1: ; loop label

INT 21H ; read a character

CMP AL, 0DH ; compare AL with CR
JNE @SKIP_1 ; jump to label @SKIP_1 if AL!=0DH
JMP @EXIT_LOOP_1 ; jump to label @EXIT_LOOP_1

@SKIP_1: ; jump label
AND AL, 0FH ; convert ascii into decimal code
SHL BL, 1 ; shift BL towards left by 1 position
OR BL, AL ; set the LSB of BL with LASB of AL
LOOP @LOOP_1 ; jump to label @LOOP_1 if CX!=0

@EXIT_LOOP_1: ; jump label

LEA DX, PROMPT_2 ; load and display the string PROMPT_2
MOV AH, 9
INT 21H

MOV CX, 8 ; initialize loop counter
MOV AH, 1 ; set input function

@LOOP_2: ; loop label
INT 21H ; read a character

CMP AL, 0DH ; compare AL with CR
JNE @SKIP_2 ; jump to label @SKIP_2 if AL!=0DH
JMP @EXIT_LOOP_2 ; jump to label @EXIT_LOOP_2

@SKIP_2: ; jump label
AND AL, 0FH ; convert ascii into decimal code
SHL BH, 1 ; shift BH towards left by 1 position
OR BH, AL ; set the LSB of BH with LASB of AL
LOOP @LOOP_2 ; jump to label @LOOP_2 if CX!=0

@EXIT_LOOP_2: ; jump label

LEA DX, PROMPT_3 ; load and display the string PROMPT_3
MOV AH, 9
INT 21H

ADD BL, BH ; add BL and BH
JNC @SKIP ; jump to label @SKIP if CF=1
MOV AH, 2 ; print the digit 1 i.e. carry
MOV DL, 31H
INT 21H

@SKIP: ; jump label

MOV CX, 8 ; initialize loop counter
MOV AH, 2 ; set output function

@LOOP_3: ; loop label
SHL BL, 1 ; shift BL towards left by 1 position
JC @ONE ; jump to label @ONE if CF=1
MOV DL, 30H ; set DL=0
JMP @DISPLAY ; jump to label @DISPLAY

@ONE: ; jump label
MOV DL, 31H ; set DL=1

@DISPLAY: ; jump label
INT 21H ; print the character
LOOP @LOOP_3 ; jump to label @LOOP_3 if CX!=0

MOV AH, 4CH ; return control to DOS
INT 21H
MAIN ENDP
END MAIN

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