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    <p>One of the most important things, a developer should learn to do is to read compiler's messages. It's clear enough:</p> <pre><code>error: no matching function for call to 'Addition::add()' </code></pre> <p>Your function in your class is </p> <pre><code>int add (int x, int y) </code></pre> <p>it takes 2 arguments and you pass none:</p> <pre><code>addobj.add(); </code></pre> <hr> <p>You have 2 options:</p> <ul> <li>create and initialize <code>x</code> and <code>y</code> inside your <code>main</code> and pass them as arguments</li> <li>make <code>add</code> without parameters, create <code>x</code> and <code>y</code> inside <code>add</code>'s body, as their values are taken from user input.</li> </ul> <p>In this case, as the function's name is <code>add</code>, I'd chose the first option:</p> <ul> <li>declare <code>int x, y;</code> inside your <code>main</code></li> <li>read the user input inside the <code>main</code> (the part, where you use <code>cin</code> and <code>cout</code>)</li> <li>pass the <code>x</code> and <code>y</code> as arguments to <code>add</code> like this: <code>addobj.add( x, y );</code></li> <li>store the result (if needed), like this: <code>int result = addobj.add( x, y );</code></li> </ul>
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    1. PO"invalid use of non static member function" What is this?
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    1. USKiril Kirov
    1. USKiril Kirov
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    1. PO"invalid use of non static member function" What is this?
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    1. COHey Kiril, thanks for the comprehensive answer, I was able to figure out what's wrong from my original problem. However, I am not able to get the result thing working properly. I created an integer "ans" in my main and set it equal to addobj.add(num1, num2). Then in another cout, I tried to display "int result." However, I got yet another error. Tried my best to figure out what's wrong, but alas didn't find the error. It says "addobj was not declared in the scope" pointing to the line where I set it equal to the answer integer. As you can see I have clearly specified Addition addobj.
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    2. CO@Carpetfizz - you need to define `addobj` before using it. Watching your edit, move the line `Addition addobj;` before `int ans=addobj.add(num1,num2);`. Then, to get the **correct** result, first you **must** initialize the `num1` and `num2`, before passing them as arguments. In other words, move the line `int ans=addobj.add(num1,num2);` **after** the last `cin`. And the last thing - `addobj.add(num1,num2);` is unnecessary - you have two calls of `add` - one, that you store the result and this one. Remove this one, leave the one with storing the `ans`.
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    3. COWow thank you sooo much!!! Worked perfectly! This is great, I'll practice some more with classes so that I can do the things you told in my first time around! Thanks again Kiril, and also everyone else who helped me out :)
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