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2.4.5 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"

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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