HelloWorld.asm

 print macro msg
        lea dx,msg
        mov ah,09h
        int 21h
    endm

    read macro n,j1,j2
        mov cx,0ah
    j1:mov ah,01h
        int 21h                     
        cmp al,0dh
        je j2
        sub al,30h
        mov bl,al
        mov ax,n
        mul cx
        xor bh,bh
        add ax,bx
        mov n,ax
        jmp j1
    j2 :nop
    endm

    .model small
    .stack 100h

    .data
        msg1 db 10,13,'Enter the 1st number: $'
        msg2 db 10,13,'Enter the 2nd number: $'
        msg3 db 10,13,'The LCM= $'
        data1 dw 0
        data2 dw 0
        dat1 dw 0
        dat2 dw 0
    
    .code
    main proc

        mov ax,@data
        mov ds,ax
        print msg1
    
        ;reading 1st multidigit number
        read data1,jump1,jump2
    
        print msg2
        ;reading 2nd multidigit number
        read data2,jump3,jump4
     
        ;copy the data1 and data2 to dat1& dat2
        mov bx,data1
        mov dat1,bx
    
        mov cx,data2
        mov dat2,cx
    
        ;Algorithm for finding lcm
        ;if(dat1=dat2) then  finish, lcm=dat1 or dat2
        ;elseif(dat1<dat2) then  dat1=dat1+data1
        ;else dat2=dat2+data2
        ;repeat 
    loop1:mov ax,dat1
        cmp ax,dat2
        je jump5
        jc jump6
     
        mov ax,dat2
        add ax,cx
        mov dat2,ax
        jmp loop1

    jump6:mov ax,dat1
        add ax,bx
        mov dat1,ax
        jmp loop1
     
        ;printing LCM
    jump5:mov bx,0ah
        xor cx,cx
    
        ;push into stack
    p1:xor dx,dx
        div bx
        push dx
        inc cx
        cmp ax,00h
        jne p1

        print msg3
        ;pop from stack
    display:pop dx
        add dl,30h
        mov ah,02h
        int 21h
        loop display
        mov ah,4ch
        int 21h

    main endp

    end

created 3 years ago

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section
To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section
To declare variables
text section
_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret