Ace Your C++ Skills 2025 – Rock the ‘Thinking in C++’ Challenge!

Question: 1 / 565

What happens if 'oneChar()' is called without argument before it is initialized with a call like 'oneChar(a)'?

The function returns the first character of 'a'

The function returns 0

The function leads to a requirement failure

If 'oneChar()' is called without any argument, it would lead to an error because there is no value to return. Without an argument, the function does not know what value to return as the first character. Therefore, option A and B are incorrect. Option D is also incorrect because the function does not initialize 's' with a default string, it only returns the first character of the given string. The correct choice is option C, as calling 'oneChar()' without any argument would not satisfy the requirement of providing a string to return the first character from.

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The function initializes 's' with a default string

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