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Which class can have member functions without their implementation?

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Which class can have member functions without their implementation?

(a) Default class

(b) String class

(c) Template class

(d) Abstract class

The question was asked in my homework.

I want to ask this question from Classes topic in section OOPs Concept & Features of Object Oriented Programming

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Best answer
Right option is (d) Abstract class

The explanation is: Abstract classes can have member functions with no implementation, where the inheriting subclasses must implement those functions.

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