MASM Microsoft Assembly x86

Here’s how you can print “Hello World!” using Microsoft Assembly Language (MASM) for x86:

.386
.model flat, stdcall
option casemap:none

; Include necessary libraries
include windows.inc
include kernel32.inc
includelib kernel32.lib
includelib user32.lib

.data
    hello db 'Hello World!', 0

.code
start:
    ; Call the ExitProcess function to exit the program
    invoke ExitProcess, 0

    ; Main function code would go here if we were writing a more complex program

end start

To compile and run this program, you’ll need Microsoft Visual Studio (with MASM installed), or another assembler compatible with MASM syntax.

This particular example doesn’t actually display “Hello World!” on the screen because it’s a minimal example and lacks the necessary Win32 API function calls to output text. To show text in a Windows console application, you’d need to add the GetStdHandle, WriteConsoleA (or similar) commands, which is beyond this basic example.

For full “Hello World!” in MASM x86 with Console Output:

“`assembly
.386
.model flat, stdcall
option casemap:none

; Include necessary libraries
include windows.inc
include kernel32.inc
includelib kernel32.lib
includelib user32.lib

.data
hello db 'Hello World!', 0

.code
start:
; Get standard output handle
invoke GetStdHandle, -11

<pre><code>; Write to console
invoke WriteConsoleA, eax, addr hello, sizeof hello, 0, 0

; Exit the process
invoke ExitProcess, 0
</code></pre>

end start
“`

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