How do I integrate a function in C++
<p>I'm learning C++, and find no answer to the following:</p>

<p>I have a formula that calculates a result of two numbers from user input​​.</p>

<ul>
<li>How should the header file (".h") look, which contains this formula?</li>
<li>How do I get the formula from the source code (".cpp")?</li>
<li>How do I pass the result to the source code (".cpp")?</li>
</ul>

<p>For you old-timers this is not a topic. Where can I find a good tutorial on C + +?</p>

<p>Greetings, Dino</p>
