Mutiple files return value issue

[CaptnJunks]

So I am toying with multiple files and learning how to link them together and I have run into an issue I cant locate a solution. So this is as short as possible I will show the .h example, I linked a .cpp as well, same results. Real basic add program that get input from user.

**note: i am using 5 as all my inputs because thats easy to add, and all my code comments reflect this.

multi1.cpp

#include <iostream>
#include "multi2.h"

	
	int x = 0;

int function1();

int main()
{	
	int a = 0;
	int b = 0;
	using namespace std;                                                          // I make comments
		cout << "hello world!" << endl;
		cout << "Enter 2 Single Digit Numbers"  << endl;
			cin >> a;
			cin >> b;
			x = a + b;
			cout << x << endl;               //checking math and its ok
			function1(x);
			cout << x << endl;                                              //how is this 10 again??
			cout << "Your total all added together is " << x << endl;
		cout << "Press any enter to continue....."  << endl;
		cin.clear();
		cin.ignore(255, '\n');
		cin.get();
	return 0;
	
}

and the multi2.h:

#ifndef MULTI2_H       //header gaurds
#define MULTI2_H

int a = 0;
int b = 0;


int function1(int x)
{
	using namespace std;
		cout << "Are you having fun yet?"  << endl;
		cout << "Gimme 2 more please"  << endl;
			cin >> a;
			cin >> b;
			x = x + a + b;
			cout << x << endl;          //math check here and still good
	return x;		
}

#endif 

and the output:

hello world!
Enter 2 Single Digit Numbers
5 <- cin a
5 <- cin b
10 <- first output
Are you having fun yet?
Gimme 2 more please
5 <- cin a
5 <- cin b
20 <- so its passing 10 to function1 in the .h
10 <- but Main still thinks this is 10
Your total all together is 10 <- wrong!!

So I know this is probaly some alternate type of return statement in then .h file that I don't know about yet, or this is some other type of fundemental issue. Please steer me in the right direction. Thank You!

[Peter87]

You don't do anything with the return value. If you want x in main to get the value that is returned from the function you have to assign it.
x = function1(x);

[CaptnJunks]

Almost worked, exept when run the program calls the function a second time. How do I assign function1 value for x without another recall? Thank you, getting me closer.

**DOH!! im an idiot, wrong place, haha. Thanks!