HP 3000 Manuals HP 3000 Manuals
Integer Constants
Integer constants represent integer values.
Syntax
integer-constant ::=
decimal-constant [integer-suffix]
octal-constant [integer-suffix]
hexadecimal-constant [integer-suffix]
decimal-constant ::=
nonzero-digit
decimal-constant digit
octal-constant ::=
0
octal-constant octal-digit
hexadecimal-constant ::=
0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit
nonzero-digit ::= any character from the set
1 2 3 4 5 6 7 8 9
octal-digit ::= any character from the set
0 1 2 3 4 5 6 7
hexadecimal-digit ::= any character from the set
0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F
integer-suffix ::=
unsigned-suffix [long-sufix]
long-suffix [unsigned-suffix]
unsigned-suffix ::= any character from the set
u U
long-suffix ::= any character from the set
l L
NOTE The u and U suffixes are available only in ANSI mode.
Description
An integer constant begins with a digit, but has no period or exponent
part. It may have a prefix that specifies its base (decimal, octal, or
hexadecimal) and suffix that specifies its type.
The size and type of integer constants are described in Chapter 9, HP
C/iX Implementation Topics.
Octal constants begin with a zero and can contain only octal digits.
Several examples of octal constants are:
077 01L 01234567 0222l
Hexadecimal constants begin with either 0x or 0X. The case of the x
character makes no difference to the constant's value. The following are
examples of hexadecimal constants:
0xACE 0XbAf 0x12L
The suffix L or l stands for long. The suffix U or u stands for
unsigned. Both can be used on all three types of integer constants
(decimal, octal, and hexadecimal).
The type of an integer constant is the first of the corresponding list in
which its value can be represented, as described below.
* Unsuffixed decimal: int, unsigned long int.
* Unsuffixed octal or hexadecimal: int, unsigned int.
* Suffixed by the letter u or U: unsigned int.
* Suffixed by the letter l or L: long int, unsigned long int.
* Suffixed by both the letters u or U and l or L: unsigned long int.
Examples
0xFFFFu unsigned int, hexadecimal
4196L signed long int, decimal
0X89ab signed int, hexadecimal
047L signed long int, octal
64U unsigned int, decimal
15 signed int, decimal
15L signed long int, decimal
15U unsigned int, decimal
15UL unsigned long int, decimal
15LU unsigned long int, decimal
0125 signed int, octal