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

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Test your C++ skills with our quiz based on Bruce Eckel's 'Thinking in C++'. Dive into object-oriented programming, advanced topics, and fundamentals. Perfect for learners and experts alike. Assess your knowledge and become a C++ master!

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!

Practice this question and more.

What is the primary use of a union as described in the text?

Optimization of memory usage
Grouping different types
Allowing type-safe conversions
Ensuring data alignment

The correct answer is: Optimization of memory usage

A union is a data structure that allows multiple variables of different types to be stored in the same memory space. By choosing the correct data type to store in a union, memory can be optimized as there is no need to allocate additional memory for each variable. This also helps in improving the performance of the program. Option B is incorrect because unions are primarily used for storing different types of data and not grouping them together. Option C is incorrect because type-safe conversions are not the primary use of a union, although they are possible. Option D is incorrect because data alignment is not the primary purpose of using a union, although it may be a side effect.