Answer Posted / shashank and nishant

In call by reference the the object will get change.
In calle by value it won't.

call by reference passes the address of the argument into
the required subroutine, thenh when it is altered in the
subroutine, its altered value will overwrite the original
argument value.

call by value only passes the value to the subroutine(i.e.
the subfunction defined)and this does not overwrite the
argument value.

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