in operator overloading definition
bool operator==(const Student &s)
why is the const keyword used while passing the object by reference?
if the state of object is not to be disturbed why not use this directly :
bool operator==(Student s)
Operator overloading definition argument
we use const so that inside function it is not changed
we want to pass it as read only object
operator overloading work even if we didn’t use const but
it’s a good practice to use const
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