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

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Prepare for the ultimate C++ challenge with our comprehensive quiz based on 'Thinking in C++'. Test your knowledge with engaging questions and receive instant feedback. Perfect for both beginners and experienced C++ programmers looking to sharpen their skills!

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What is the purpose of 'const' in a function's return type when dealing with user-defined types?

Improve memory usage
Prevent the return value from being modified
Enhance type safety
Ensure constant folding

The correct answer is: Prevent the return value from being modified

'const' in a function's return type is used to prevent the return value from being modified. When dealing with user-defined types, it is important to ensure that the return value is not accidentally modified, which can cause unexpected results in the program. The other options, while related to the use of 'const' in programming, do not accurately describe its purpose in this specific scenario. Improving memory usage, enhancing type safety, and ensuring constant folding are all potential benefits of using 'const' in different situations, but they are not the primary purpose in this case.