Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++'

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Challenge your C++ knowledge with a comprehensive quiz based on 'Thinking in C++'. Explore a variety of multiple choice questions with hints and explanations to solidify your understanding. Get prepared!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What characterizes an anonymous union within a class?

  1. It has no name and can be globally defined

  2. It allows direct access to its members without an object

  3. It cannot contain any constructors or destructors

  4. It requires static declaration if at file scope

The correct answer is: It requires static declaration if at file scope

An anonymous union within a class is a union that is declared without a name, similar to a struct. This can be useful for defining multiple variables together, especially when those variables might not be used at the same time. In this context, the other options are incorrect because - Option A & B: Name and access are not the defining characteristics of an anonymous union, as these can also be present in regular unions. - Option C: Constructors and destructors are not allowed in any type of union, anonymous or not, as unions do not have any instance-specific variables to initialize or destroy. Hence, option D is the only option that accurately describes the special syntax required for defining an anonymous union within a class.