Ace Your C++ Skills 2026 – Rock the ‘Thinking in C++’ Challenge!

Question: 1 / 565

What is the effect of passing a non-null argument, such as 'a', to 'oneChar()' after its initial call?

Re-initializes 's' with the new argument

Passing a non-null argument, such as 'a', to 'oneChar()' after its initial call would re-initialize the string 's' with the new argument. This means that the previous value of 's' would be overwritten and the function would then return the first character of the new argument. This effect would not be produced if a null argument was passed, as 's' can only be initialized once and would not be affected by additional calls to the function. Choosing options B or C would be incorrect, as the function only returns a character and does not produce any requirement failures. Option D is also incorrect, as passing a new argument would overwrite the previous value of 's' and have an effect on the final result.

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Returns the first character of the new argument

Produces a requirement failure

Has no effect as 's' can only be initialized once

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