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Character class ranges must also be properly specified with a hyphen in between two printable characters. The two following lines are both properly specified. The first accepts any character from a-z, inclusive, while the second accepts anything that is not a-z, inclusive.
| Code Block |
|---|
[a-z] [^a-z] |
Note that the range is in terms of character code values, and on an EBCDIC platform it will include some non-alphabetic codes. Consequently the isalpha() function should be used to verify the input.
Mismatches between arguments and conversion specifiers may result in undefined behavior. Many compilers can diagnose type mismatches in formatted output function invocations.
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