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The constants include integers such as
0 1 999 -512
Besides the usual decimal, or base 10, notation, integers may also be
written in other base notations. In sicstus mode, any base from
2 to 36 can be specified, while in iso mode bases 2 (binary), 8 (octal),
and 16 (hex) can be used. Letters A through
Z (upper or lower case) are used for bases greater than 10. E.g.
15 2'1111 8'17 16'f % sicstus mode 15 0b1111 0o17 0xf % iso mode
all represent the integer fifteen. Except for the first, decimal,
notation, the forms in the first line are only acceptable in
sicstus mode, while those in the second line are only valid in
iso mode.
There is also a special notation for character constants. E.g.
0'A 0'\x41 0'\101
are all equivalent to 65 (the character code for A).
0' followed by any character except \ (backslash) is thus
read as an integer. Unless character escapes have been switched off, if
0' is followed by \, the \ denotes the start of an
escape sequence with special meaning (see Escape Sequences).