Question: Hi everyone I'm learning c++ but I don't understand pass-by-value and pass-by-reference. what is (const &)? why we have to pass const with & but

Hi everyone I'm learning c++

but I don't understand pass-by-value and pass-by-reference.

what is (const &)? why we have to pass const with & but not just &?

please explain thank you so much!

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