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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] [FIO00-C. Take care when creating format strings^a^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.
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