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

Question: 1 / 565

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

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.

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Grouping different types

Allowing type-safe conversions

Ensuring data alignment

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