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    <p>When you create an object in C++, the constructor goes through the following sequence:</p> <ol> <li>Call the constructors of all parent virtual classes in the entire class tree (In an arbitrary order)</li> <li>Call the constructors of all directly inherited parent classes in the order of declaration</li> <li>Call the constructors of all member variables in the order of declaration</li> </ol> <p>There are a few more specifics than this, and some compilers allow you to force a few things out of this specific order, but this is the general idea. For each of these constructor calls you can specify the constructor arguments, in which case C++ will call the constructor as specified, or you can leave it alone and C++ will try to call the default constructor. The default constructor is simply the one that takes no arguments.</p> <p>If any of your virtual parent classes, non-virtual parent classes, or member variables don't have a default constructor or need to be created with something other than the default, you add them to the list of constructor calls. Because C++ assumes a default constructor call, there is absolutely no difference between putting a default constructor in the list and leaving it out entirely (C++ will not (unless under special circumstances outside the scope of this question) create an object without a call to a constructor of some sort). If a class does not have a default constructor and you do not provide a constructor call, the compiler will throw an error.</p> <p>When it comes to built in types such <code>float</code> or <code>int</code>, the default constructor does nothing at all, and so the variable will have the default value of whatever was left in the piece of memory. All built in types also have a copy constructor so you can you can initialize them by passing their initial value as the only argument to the variable's constructor.</p>
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    1. POWhen do I have to use initializer lists for initializing C++ class members?
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    1. USJason E
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