2.4.3 Numeric literals
There are four types of numeric literals: plain integers, long integers, floating point numbers, and imaginary numbers. There are no complex literals (complex numbers can be formed by adding a real number and an imaginary number).
Note that numeric literals do not include a sign; a phrase like
-1 is actually an expression composed of the unary operator
`-' and the literal 1.
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Release 2.4.4c1, documentation updated on 11 October 2006.