 %macro display 2
mov eax,4
mov ebx,1
mov ecx, %1
mov edx, %2
int 80h
%endmacro
%macro accept 2
mov eax,3
mov ebx,0

mov ecx, %1
mov edx, %2
int 80h
%endmacro
section .data
txt db "Enter the number1: "
txtlen equ $-txt
txt1 db "Enter the number2: "
txtlen1 equ $-txt1
txt3 db "result in bin is: "
txtlen3 equ $-txt3
newline db 0ah
newlinelen equ $-newline
section .bss
num1 resb 2
num2 resb 2
result resb 2
bin resb 8
section .txt
global _start
_start:
;accept num1
display txt,txtlen
accept num1,2
;accept num2
display txt1,txtlen1
accept num2,2
;unpacking num1 and num2 in bl and al respectively
mov bl,byte[num1]
mov al,byte[num2]
cmp al,39h
jle hexvalue
sub al,7h

hexvalue:
sub al,30h
cmp bl,39h
jle hexvalue2
sub bl,7h
hexvalue2:
sub bl,30h
xor al,bl ;al has number in decimal
;add al,30h
;mov byte[result],al
;display result,2
mov bx,0
mov bx,2
mov cx,0 ;counter to count no of element in stack
up: mov dx,0
div bx
push dx ;push remainder in stack
inc cx
cmp ax,0 ;continue till you get Q as 0
jnz up
mov esi,bin
mov dx,0
up1:
pop dx ;pop in dx
add dl,30h
mov byte[esi],dl ;store in bin string
inc esi
dec cx ;continue till all elements are poped
jnz up1
;display result in binary
display newline,newlinelen
display txt3,txtlen3
display bin,4
exit:
mov eax,1
mov ebx,0
int 80h

created 12 months ago by Felicia

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