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- using invalid conversion specifiers
- using a length modifier on an incorrect specifier
- argument and conversion specifier type mismatch
- using invalid character classes
The following are C99 compliant conversion specifiers. Using any other specifier may result in undefined behavior.
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| Code Block |
|---|
d, i, o, u, x, X, a, A, e, E, f, F, g, G
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Also, character class ranges must 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]
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Having an argument and conversion specifier mismatch may result in undefined behavior.
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