C++ const modifier with primitive types

Question

Should I pay attention on const modifier working with primitive types? Which one is more syntactically correct and why?

First version:

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Answer 1

There's no difference at all between the 2nd and the 3rd versions. Choose one which is the shortest to type :)

There's a little difference between the 1st and the 3rd. You might prefer the 3rd if you are afraid of accidentally modifying a and b inside the function.