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Floating point numbers are the computer equivalent of scientific notation;
you can think of a floating point number as a fraction together with a power
of ten. The precise number of significant figures and the range of possible
exponents is machine-specific; Emacs uses the C data type double to
store the value, and internally this records a power of 2 rather than a
power of 10.
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.
@xref{Numbers}, for more information.
Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.