ASM: Basic usage of assembly instructions

This program shows usage of basic assembly instructions add, cmp, dec, jnz, jz, mov, mul, pop, push, xor

	.386
	.model flat, stdcall
	option casemap :none
	include \masm32\include\windows.inc
	include \masm32\include\kernel32.inc
	include \masm32\include\masm32.inc
	includelib \masm32\lib\kernel32.lib
	includelib \masm32\lib\masm32.lib
	.data
	BadText db "Error: Sum is incorrect value", 0
	GoodText db "Excellent! Sum is 6", 0
	Sum sdword 0
	.code
	start:
	; eax
	mov ecx, 6 ; set the counter to 6 ?
	xor eax, eax ; set eax to 0 0
	_label: add eax, ecx ; add the numbers ?
	dec ecx ; from 0 to 6 ?
	jnz _label ; 21
	mov edx, 7 ; 21
	mul edx ; multiply by 7 147
	push eax ; pushes eax into the stack
	pop Sum ; pops eax and places it in Sum
	cmp Sum, 147 ; compares Sum to 147
	jz _good ; if they are equal, go to _good
	_bad: invoke StdOut, addr BadText
	jmp _quit
	_good: invoke StdOut, addr GoodText
	_quit: invoke ExitProcess, 0
	end start

view raw basicinstructions.asm hosted with ❤ by GitHub

Pre-requisite:

• Install MASM

To assemble:

\masm32\bin\ml /c /Zd /coff basicinstructions.asm

To link:

\masm32\bin\Link /SUBSYSTEM:CONSOLE basicinstructions.obj

Reference(s):
This is shamelessly using contents from Windows Assembly Programming Tutorial  by JEFF HUANG (huang6@uiuc.edu)