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

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What happens when an overloaded function is called in C++ but matches none of the overloaded functions exactly?

A runtime error occurs

The program fails to compile

The closest match is called if possible

When an overloaded function is called but doesn't match any of the overloaded functions exactly, C++ will attempt to find the closest match. This means that the program does not fail to compile or generate a runtime error, as options B and A suggest. Similarly, while it may generate a default version of the function, this is not always the case and does not accurately describe what happens in this situation. Thus, option D is incorrect. The closest match being called can also happen even if there are multiple overloaded functions that are equally close, as long as they are closer than any other options. This makes option C the best choice.

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A default version of the function is generated and called

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