I'm still relatively new to C++ and I can't seem to figure out the difference in the following two ways of coding a function that may take one parameter or maybe two or three or more. Anyway, here's my point

function overload:

int aClass::doSomething(int required)
{
    //DO SOMETHING
}

int aClass::doSomething(int required, int optional)
{
    //DO SOMETHING
}

how is this different to, default value:

int aClass::doSomething(int required, int optional = 0)
{
    //DO SOMETHING
}

I know in different circumstances one may be more suitable than another but what kinds of things should I be aware of when choosing between each of these options?

c++ overloading default
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