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Just as a broken clock shows the correct time twice a day, you can use this syntax to input hexadecimal numbers less than 0A.

Less than 8 actually. 0 at the start of a number indicates it’s octal, so 08 and 09 are not syntactically valid numbers.

Though think they might be accepted if using pre-ansi standard. Remember reading that in the changes list in my 2nd edition copy of k&r