Code Snippet: Prompt for Yes or No

From Coder Merlin
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Within these castle walls be forged Mavens of Computer Science ...
— Merlin, The Coder

// Prompt the user for 'yes' or 'no' var line : String? repeat { 

    print("Please enter 'yes' or 'no' ->", terminator:"")
    line = readLine()

} while (line == nil || (line! != "yes" && line! != "no"))

// By the time we get here, line! is either "yes" or "no"

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