 assume cs:code,ds:data
data segment 
	msg1 db 0ah,0dh, "enter  no$"
	msg2 db 0ah,0dh,"sum is$"
	num1 dw 0000h
	num2 dw 0000h
data ends
code segment 
	print macro msg
		lea dx,msg
		mov ah,09h
		int 21h
	endm
	
	read proc
		xor ax,ax
		push ax
		l1:
			mov ah,01h
			int 21h
			cmp al,0dh
			je l2
			mov ah,00h
			sub al,30h
			mov bx,ax
			mov dx,000ah
			pop ax
			mul dx
			add ax,bx
			push ax
			jmp l1
		l2:
			pop ax
			ret
	read endp
	
	display proc
		push dx
		mov bx,000ah
		xor cx,cx
		l3:
			xor dx,dx
			div bx
			add dx,0030h
			push dx
			inc cx
			cmp ax,0000h
			jnz l3
		l4:
			pop dx
			mov ah,02h
			int 21h
			loop l4
			pop dx
			ret
	display endp

	addtn proc
		mov ax,num1
		mov bx,num2
		add ax,bx
		call display
		ret
	addtn endp

	start:
		mov ax,data
		mov ds,ax
		print msg1
		call read
		mov num1,ax
		print msg1
		call read
		mov num2,ax
		print msg2
		call addtn
		mov ah,4ch
		int 21h
code ends
end start

created 4 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