 .386
.model flat, stdcall
option casemap:none

include \masm32\include\masm32rt.inc
include \masm32\macros\macros.asm
includelib \masm32\lib\masm32.lib

.data
    addition_result_msg db "The addition result is ", 0
    multiplication_result_msg db "The multiplication result is ", 0
    division_result_msg db "The division result is ", 0
    newline db 13, 10, 0
    result_buffer db 16 dup(?), 0

.code
start:
    ; Display message
    print "This program will store 30 and 20 in the EAX and EBX respectively, to find out the additional, multiplication and division results", 13, 10

    ; Store 30 in EAX and 20 in EBX
    mov eax, 30
    mov ebx, 20

    ; Addition
    add eax, ebx
    print addition_result_msg
    call IntToStr
    print offset result_buffer
    print newline

    ; Restore EAX to 30
    mov eax, 30

    ; Multiplication
    imul ebx
    print multiplication_result_msg
    call IntToStr
    print offset result_buffer
    print newline

    ; Restore EAX to 30
    mov eax, 30

    ; Division
    cdq ; Sign-extend EAX into EDX: EAX for division
    idiv ebx
    print division_result_msg
    call IntToStr
    print offset result_buffer
    print newline

    exit

IntToStr proc
    push ebx
    push ecx
    push edx
    push esi
    push edi

    mov esi, eax        ; esi = input number
    mov edi, offset result_buffer + 15 ; edi = end of buffer
    mov byte ptr [edi], 0  ; Null-terminate the string

    mov ecx, 10         ; divisor

convert_loop:
    xor edx, edx       ; clear edx for division
    div ecx            ; divide esi by 10, quotient in eax, remainder in edx
    add dl, '0'        ; convert remainder to ASCII
    dec edi            ; move destination pointer
    mov [edi], dl      ; store ASCII digit
    test eax, eax      ; check if quotient is zero
    jnz convert_loop   ; if not, continue loop

    mov esi, edi       ; move back to beginning of string
    mov edi, offset result_buffer  ; destination pointer

copy_loop:
    mov al, [esi]      ; move character from source to destination
    mov [edi], al
    inc edi            ; move destination pointer
    cmp al, 0          ; check for null terminator
    je end_convert     ; if null terminator, exit loop
    dec esi            ; move source pointer
    jmp copy_loop      ; continue loop

end_convert:
    pop edi
    pop esi
    pop edx
    pop ecx
    pop ebx
    ret
IntToStr endp

end start

created 1 year 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