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 a copy-constructor in C++ used for?

To copy the values of all variables
To create a new thread
To create a new object as a copy of an existing object
To delete an object

The correct answer is: To create a new object as a copy of an existing object

A copy-constructor in C++ is a constructor that initializes a new object using an existing object as a source. This is different from an assignment operator, which only copies the values of the variables. A copy-constructor is used when you want to create a completely new object with its own unique memory space and values, rather than simply referencing an existing object. Creating a new thread (option B) and deleting an object (option D) are unrelated to copy-constructors and are not valid uses for them. Option A is incorrect because it implies that the copy-constructor only copies the values of the variables, whereas it actually creates a new object.