Answer Posted / achal ubbott

When we use 'pass by value' method, acopy of the object is
sent to the called function. So the copy constructor of the
object gets called. But the called function cannot modify
the content of the original object.
But references of an object are like alias. When 'pass by
reference ' is used it is actually using address at the
underlying. This way the called function may modify the
contents of the original object since operations are being
performed over the same object using its address, not on
the copy.

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