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GNU Emacs supports two numeric data types: integers and
floating-point numbers. Integers are whole numbers such as
−3, 0, 7, 13, and 511. Floating-point numbers are numbers with
fractional parts, such as −4.5, 0.0, and 2.71828. They can
also be expressed in exponential notation: ‘`1.5e2`’ is the same as
‘`150.0`’; here, ‘`e2`’ stands for ten to the second power, and
that is multiplied by 1.5. Integer computations are exact, though
they may overflow. Floating-point computations often involve rounding
errors, as the numbers have a fixed amount of precision.