2.4.4 Integer and long integer literals

Integer and long integer literals are described by the following lexical definitions:

longinteger  ::=  integer ("l" | "L")
integer  ::=  decimalinteger | octinteger | hexinteger
decimalinteger  ::=  nonzerodigit digit* | "0"
octinteger  ::=  "0" octdigit+
hexinteger  ::=  "0" ("x" | "X") hexdigit+
nonzerodigit  ::=  "1"..."9"
octdigit  ::=  "0"..."7"
hexdigit  ::=  digit | "a"..."f" | "A"..."F"
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Although both lower case `l' and upper case `L' are allowed as suffix for long integers, it is strongly recommended to always use `L', since the letter `l' looks too much like the digit `1'.

Plain integer decimal literals must be at most 2147483647 (i.e., the largest positive integer, using 32-bit arithmetic). Plain octal and hexadecimal literals may be as large as 4294967295, but values larger than 2147483647 are converted to a negative value by subtracting 4294967296. There is no limit for long integer literals apart from what can be stored in available memory.

Some examples of plain and long integer literals:

7     2147483647                        0177    0x80000000
3L    79228162514264337593543950336L    0377L   0x100000000L

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