HelloWorld.asm

 include io.h

.model small
.stack 200h

arrayLength equ 4

.data
str1 	db 		50 dup(?)
arrw   	dw      arrayLength dup(?)
crlf    db 		10,13,0

.code

sort proc
for2:
		
		s2:	cmp [si],ax
			jg big
			jmp edame
		big:
			mov  bx,[si]
			mov [si],ax
			mov [di],bx
		edame:
		cmp ax,0
		jnz sd
		jmp s0
		sd:
		add si,2
		add di,2
		mov   ax,[di]
		jmp edame2
		s0:
		mov   si, offset arrw
		mov   di, si
		add   di,2
		mov   ax,[di]
	edame2:
loop for2
ret
sort endp

Main   proc
       mov ax, @data
	   mov ds, ax
	   ;---------------------------
	   mov   si, offset arrw
	   mov   cx, arrayLength
for1:	   
	   inputs    str1,5 
	   output crlf
	   atoi      str1     
	   mov       [si], ax
	   add       si, 2
	   loop  for1
	   
    mov bx,arrayLength
while1: cmp bx,0
		jbe endwhile1
	mov   si, offset arrw
	mov   di, si
	add   di,2
	mov   ax,[di]
	mov cx,arrayLength
	sub bx,1
call sort 
jmp while1
endwhile1:
	   
	   output  crlf
	   mov   si, offset arrw
	   mov   cx, arrayLength
for3:	   
	   itoa   str1,[si]
	   output  crlf
	   output  str1
	   add si,2
	   loop   for3
		
	   ;---------------------------
	   mov   ax,4c00h
	   int 21h
Main   endp
       end   Main

created 4 years ago by Samiullah sami

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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