If a base class constructor is not called explicitly in the definition of a derived class constructor,an error results.

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Quizplus · Accepted Answer

If a base class constructor is not explicitly called in a derived class constructor, the default constructor of the base class is implicitly called, assuming it exists and is accessible. If the base class does not have a default constructor, then it must be explicitly called, or it will result in a compile-time error.

If a Base Class Constructor Is Not Called Explicitly in the Definition