3.10.1

Integer Literals

LEXICAL STRUCTURE

An integer literal is of type

long

 if it is suffixed with an ASCII letter

L

 or

l

(ell); otherwise it is of type

int

 ( 4.2.1). The suffix

L

 is preferred, because the let 

ter

l

 (ell) is often hard to distinguish from the digit

1

 (one).

A decimal numeral is either the single ASCII character

0

, representing the

integer zero, or consists of an ASCII digit from

1

 to

9

, optionally followed by one

or more ASCII digits from

0

 to

9

, representing a positive integer:

DecimalNumeral:

0

NonZeroDigit Digits

opt

Digits:

Digit

Digits Digit

Digit:

0

NonZeroDigit

NonZeroDigit: one of

1 2 3 4 5 6 7 8 9

A hexadecimal numeral consists of the leading ASCII characters

0x

 or

0X

 fol 

lowed by one or more ASCII hexadecimal digits and can represent a positive,

zero, or negative integer. Hexadecimal digits with values 10 through 15 are repre 

sented by the ASCII letters

a

 through

f

 or

A

 through

F

, respectively; each letter

used as a hexadecimal digit may be uppercase or lowercase.

HexNumeral:

0 x

HexDigit

0 X

HexDigit

HexNumeral HexDigit

The following production from  3.3 is repeated here for clarity:

HexDigit: one of

0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F

An octal numeral consists of an ASCII digit

0

 followed by one or more of the

ASCII digits

0

 through

7

 and can represent a positive, zero, or negative integer.

OctalNumeral:

0

OctalDigit

OctalNumeral OctalDigit

OctalDigit: one of

0 1 2 3 4 5 6 7

20