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How to detect the presence of Extended ASCII values (128 to 255) in a C++ character array.
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Please remember that there is no such thing as extended ASCII. ASCII was and is only defined between 0 and 127. Everything above that is either invalid or needs to be in a defined encoding other than ASCII (for example ISO-8859-1).
Please read The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!).
Other than that: what's wrong with iterating over it and check for any value > 127 (or <0 when using signed
chars)?Char can be signed or unsigned. This doesn't really matter, though. You actually want to check if each character is valid ASCII. This is a positive, non-ambiguous check. You simply check if each char is both >=0 and <= 127. Anything else (whether positive or negative, "Extended ASCII" or UTF-8) is invalid.