Numeric literals can take any of the following forms:
Is a sequence of characters using only the digits 0 to 9.
Is a sequence of characters using only the digits 0 to 9 and the letters A to F or a to f.
Is a single digit between 2 and 9 inclusive, followed by an underscore character.
Is a sequence of characters using only the digits 0 to (
Is any single character except a single quote. Use the standard C escape character (\') if you require a single quote. The character must be enclosed within opening and closing single quotes. In this case the value of the numeric literal is the numeric code of the character.
must not use any other characters. The sequence of characters must
evaluate to an integer in the range 0 to 232-1
DCQU directives, where
the range is 0 to 264-1).