(lispref.info)Floating Point Type

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Floating Point Type

   Emacs version 19 supports floating point numbers, if compiled with
the macro `LISP_FLOAT_TYPE' defined.  The precise range of floating
point numbers is machine-specific.

   The printed representation for floating point numbers requires either
a decimal point (with at least one digit following), an exponent, or
both.  For example, `1500.0', `15e2', `15.0e2', `1.5e3', and `.15e4'
are five ways of writing a floating point number whose value is 1500.
They are all equivalent.

   Note: Numbers, for more information.

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