4.13.1 Integer Constants

Larch/C++ integer constants are exactly the sames as those of C++. See section 4.6 Identifiers for the lexical syntax of digit.

integer-constant  ::= decimal-constant | octal-constant | hex-constant
decimal-constant ::= one-to-nine [ digit ] ... [integer-suffix]
one-to-nine      ::= 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
octal-constant   ::= 0 [ octal-digit ] ... [integer-suffix]
octal-digit      ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
hex-constant     ::= 0 hex-indicator hex-digit [ hex-digit ] ... [integer-suffix]
hex-indicator    ::= x | X
hex-digit        ::= digit | a | b | c | d | e | f | A | B | C | D | E | F
integer-suffix   ::= long-suffix | unsigned-suffix
        | long-suffix unsigned-suffix | unsigned-suffix long-suffix
long-suffix ::= l | L
unsigned-suffix ::= u | U

Some examples of integer-constants follow.

227
228U
0342L
0xFFFFFFFFul

The meaning of an integer-constant is as in C++ (See Section 2.5.1 of [Ellis-Stroustrup90]), except that the sort of an integer-constant is always int, unless a suffix is present. This makes the specification independent of a particular C++ implementation of integers.

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