Bi-directional conversion between a number and a string. At least one of
the two arguments must be instantiated. Besides the type used to
represent the text, this predicate differs in several ways from its ISO
cousin:151Note that SWI-Prolog's
syntax for numbers is not ISO compatible either.
If String does not represent a number, the predicate fails
rather than throwing a syntax error exception.
Leading white space and Prolog comments are not allowed.
Numbers may start with '+' or '-'.
It is not allowed to have white space between a leading '+'
or '-' and the number.
Floating point numbers in exponential notation do not require a dot
before exponent, i.e., "1e10" is a valid number.
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