Copy Constructor in C++ | why const and reference(&) ?

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I was trying to understand this Point from various websites but after seeing your video i got to know the exact reason.
Thanks

sundarambhaskar
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Many many thanks, I had this doubt from the beginning, even teachers couldn't clear this (could not understand why there is a recursion) but after seeing your video, it is crystal clear to me.

bukkylens
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bro why your video just 900 it should be 9M.

Nomee