What are the different ways to pass a parameter by reference and how do they differ?

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Could anyone please explain all the different types of ways to pass by parameters? Specifically, involving ampersands ('&') and the 'const' keyword. I've seen many kinds, but I don't really understand what they do, and when they should be used.

To list a few: Type & const Type const & const Type &

Also, I'm not sure what syntax to use. For example, for a parameter of type int & const called a, is it written as int & a const or int & const a? For an int const & parameter called a, is it written int const & a or int const a &?

Here is what I understand. I understand how to create a reference. I know that a reference is like an alias to an address, and does not make a copy of the parameter. I also get that the ampersand symbol can sometimes mean addresses.

If anyone could clarify this, I would really appreciate it.

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