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(Corresponds to Section 4.3 of ANSI X3.9-1978 FORTRAN 77.)

An integer constant also may have one of the following forms:

B'binary-digits' O'octal-digits' Z'hexadecimal-digits' X'hexadecimal-digits'

`binary-digits`, `octal-digits`, and `hexadecimal-digits`
are nonempty strings of characters in the set ``01`', ``01234567`',
and ``0123456789ABCDEFabcdef`', respectively.
(The value for ``A`' (and ``a`') is 10, for ``B`' and ``b`'
is 11, and so on.)