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[Zach]

Does simply * mean standard input respectively output?

[mecej4]

Depends on the context. You often seem to assume that we are able to see the lines of code that you ask about without showing those lines.

When used in place of an I/O unit number, what you wrote is correct.

However, it also stands for the multiplication operator, a pair as the exponentiation operator, and so on.

[Zach]

If in any context a sign or character could have sóo many different meanings, that one could not possibly say what it could potentially mean, then asking the question what it means, by giving examples, would be impossible. I also see :: being required in particular declaration statements, but when I leave those signs out, I get no error message. So I fear that asking what :: means would be soliciting you for the same kind of response.

[wahorger]

The language element of :: in a declaration is a way to allow additional parameters to be applied to the declaration. For some parameters, this is the only way I know of to add them. However, for simplicity, here's a few examples of equivalent declarations.