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Which is the correct condition on const member functions?

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Which is the correct condition on const member functions?

(a) Const member functions can’t call non-const member functions

(b) Const member functions can’t call any other function

(c) Const member functions can call only the functions which are neither const nor non-const

(d) Const member functions can call only data members of call not member functions

I had been asked this question in homework.

My question is taken from Constant Member Functions in portion Member Functions & its Types of Object Oriented Programming

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Right answer is (a) Const member functions can’t call non-const member functions

Best explanation: The const member functions are restricted to call any other non-const member functions. This is to ensure that the const function doesn’t have any code that might modify the calling object.

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