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    <p>You are assigning a value to a variable that doesn't exist.</p> <p>Change:</p> <pre><code>ape::ape(int num) { tall = num; } </code></pre> <p>To:</p> <pre><code>ape::ape(int num) : number(num) { } </code></pre> <p>Moreover, I don't know why you wrote a destructor, and why you decided to make it <code>virtual</code>. By default, the compiler will generate an empty destructor (similar to yours, but not <code>virtual</code>). If you don't intend to do polymorphism (with inheritance and all that "stuff"), you may delete this destructor from your code as it only brings complexity for no gain.</p> <p>You also need to prefix your method <strong>definitions</strong> with the name of the class:</p> <pre><code>int ape::getNumber() // Note the "ape::" here { return number; } </code></pre> <p>One last thing:</p> <p>You problably want to change also your <code>main</code>:</p> <pre><code>int main() { ape asd(10); cout &lt;&lt; asd.getNumber() &lt;&lt; endl; } </code></pre> <p>Something put into <code>cout</code> only gets printed when one outputs <code>endl</code> or <code>flush</code> as the stream is buffered.</p> <p>Regarding your last edit:</p> <blockquote> <p>I guess I should probably add the error message: undefined reference to 'ape::ape(int)'</p> </blockquote> <p>You probably failed to link with <code>ape.o</code>. In your compilation folder, you should have your source files and a <code>.o</code> for every <code>.cpp</code>. You have to link those <strong>object files</strong> together to build your program. This message indicates that the linker is unable to find the definition for <code>ape::ape(int)</code>. That is he was probably not given the <code>ape.o</code> file.</p> <p>Long story short, here is what your compilation commands should look like (using g++):</p> <pre><code>g++ -o main.o -c main.cpp g++ -o ape.o -c ape.cpp g++ -o program main.o ape.o </code></pre>
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    1. COThis was just Code::blocs automaking of the files. I guess I could've unchecked the option to have a destructor, but I didn't bother.
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    2. CO@MartinHaTh Oh I see. I don't use Code::Blocks. The other points stand still ;) Hope this can help.
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    3. COThe commands did the trick. I guess it's Code::blocks fault, then. Thanks for the help.
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