Program to Add Two 16 Bit Numbers Assembly Code

Objective

Write a program to Add Two 16 Bit Numbers in Assembly language. Program should use registers AX and BX to take first and second number to find the sum of two numbers.

Consider that a word of data is present in the AX register and a 2^nd word of data is present in the BX register.

We have to add word in AX with the word in BX. Using ADD instruction, add the contents.

Result will be stored in the AX register. Display the result using display routine.

For example :	AX = 1234 H		1234 H
	BX = 0100 H	+	0100 H
			1334 H

Algorithm to Add Two 16 Bit Numbers

Step I : Initialize the data segment.

Step II : Get the first number in AX register.

Step III : Get the second number in BX register.

Step IV : Add the two numbers.

Step V : Display the result.

Step VI : Stop

Program to Add Two 16 Bit Numbers :

We are taking two numbers as input using AX and BX registers which we will be using to calculate sum. After calculating sum we have to print the result as show in below code. Please find the steps which are required to run this program at the end. You should have TASM installed on your machine so that you can run this code. You can find more assembly language codes here.

<span style="font-family: arial, helvetica, sans-serif; font-size: 14pt; color: #000000;"> .model small                                                         <br/> .data  <br/> a dw 1234H  <br/> b dw 0100H  <br/> .code  <br/>      mov      ax, @data      ; Initialize data section  <br/>      mov      ds, ax  <br/>      mov      ax, a          ; Load number1 in ax  <br/>      mov      bx, b          ; Load number2 in bx  <br/>      add      ax, bx         ; add numbers. Result in ax  <br/>      mov     ch, 04h         ; Count of digits to be displayed  <br/>      mov      cl, 04h        ; Count to roll by 4 bits  <br/>      mov      bx, ax         ; Result in reg bh  <br/> l2:     rol      bx, cl      ; roll bl so that msb comes to lsb   <br/>      mov      dl, bl         ; load dl with data to be displayed  <br/>      and      dl, 0fH        ; get only lsb  <br/>      cmp      dl, 09         ; check if digit is 0-9 or letter A-F  <br/>      jbe      l4  <br/>      add      dl, 07         ; if letter add 37H else only add 30H  <br/> l4:     add      dl, 30H  <br/>      mov      ah, 02         ; Function 2 under INT 21H (Display character)  <br/>      int      21H  <br/>      dec      ch             ; Decrement Count  <br/>      jnz      l2  <br/>      mov      ah, 4cH        ; Terminate Program  <br/>      int      21H  <br/> end  <br/></span>

.model small .data a dw 1234H b dw 0100H .code mov ax, @data ; Initialize data section mov ds, ax mov ax, a ; Load number1 in ax mov bx, b ; Load number2 in bx add ax, bx ; add numbers. Result in ax mov ch, 04h ; Count of digits to be displayed mov cl, 04h ; Count to roll by 4 bits mov bx, ax ; Result in reg bh l2: rol bx, cl ; roll bl so that msb comes to lsb mov dl, bl ; load dl with data to be displayed and dl, 0fH ; get only lsb cmp dl, 09 ; check if digit is 0-9 or letter A-F jbe l4 add dl, 07 ; if letter add 37H else only add 30H l4: add dl, 30H mov ah, 02 ; Function 2 under INT 21H (Display character) int 21H dec ch ; Decrement Count jnz l2 mov ah, 4cH ; Terminate Program int 21H end

How to Run this Program :

For Running this program you should have installed Tasm on you computer . If you have not installed Tasm yet please install it.

C:
\programs>tasm 16-add.asm

Assembling file: 16-add.asm

Error messages: None

Warning messages: None

Passes: 1

Remaining memory: 438k

C:\programs>tlink 16-add

Warning: No stack

C:\programs>16-add

1334

Source projectgeek.com

Objective

Algorithm to Add Two 16 Bit Numbers

Program to Add Two 16 Bit Numbers :

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