;Main.asm
.386
.model small,c		;This bit is important, I think.
.stack 1000h

.data
	hello db "Hello world!",0

.code
	;includelib libucrt.lib						;All this shit is already here if you have a C object file
	includelib legacy_stdio_definitions.lib		;Except for this. Basically printf, puts etc
	;includelib libcmt.lib
	;includelib libvcruntime.lib ;Visual Studio exception handling and type checking. Not needed otherwise

extrn printf:near ;Extern everything you are gonna use from the c obj files
extrn plusTwo:near
extrn exit:near

public plusOne ;Have to declare it public for the linker to see it. In NASM, it's .globl or global
plusOne proc ;Our int plusOne(int) function.
	pop eax ;Parameters are stored on the stack.
	add eax, 1
	ret ;eax is whatever is returned from functions. Also why you can only return one thing.
plusOne endp

public main
main proc
	push offset hello
	call printf
	push	1
	call	plusTwo
	push 0
	call exit
main endp

end		;End of file, not program

//bruh.c
//#include <stdio.h>					Has to be included with "includelib legacy_stdio_definitions.lib" in the asm file for some reason.
//int printf(const char* format, ...);

extern int plusOne(int); //Extern everything you are gonna use from the asm obj files

int plusTwo(int num) {
	return plusOne(plusOne(num)); //Plus one is defined in the assembly.
}

x86 MASM C Linking

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# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s3:
      dhcp4: yes
      nameservers:
          addresses: [8.8.8.8,8.8.4.4]
  version: 2

default netplan

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>

var obj = {
    prop: 1,
    getProp: function(){
         return function() { console.log(this.prop) };
    },
};

obj.getProp()();

x86 MASM C Linking

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