See output of preprocessing

gistfile1.txt

g++ -E helloworld.cpp > helloworld.txt

preprocessor.cpp

#include <iostream>
using namespace std;

#include "preprocessorFun.h"

int main() {

	cout << "Hello from main()\n";
	OutsideMethod();

	return 0;
}

preprocessorFun.h

void OutsideMethod(){
	cout << "Hello from OutsideMethod()\n";
}