Topic       : C-Language Documentation
Author      : John Kormylo
Version     : C.HYP 1.0
Subject     : Documentation/C-Language
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Compiled on : Atari
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View Ref-File[ Data Types: double ]

High precision floating point.  See also float.

Normally, sizeof(double) = 10 bytes, but when the -8 option is used
(see Compiler Options) sizeof(double) = 12 bytes.

'double' has 18 significant digits and a dynamic range from 3.3E-4932
to 1.2E+4932 (not counting 0.0).  Format is 80 bit IEEE extended
precision (an extra 2 bytes are added for addressability).

Both Pure C and the 68881 FPU performs all floating point operations
in 'double'.

Note: The standard for 'double' is 64 bit IEEE double precision,
      whereas Pure C uses 80 bit IEEE extended precision (long double).
      One can use functions dxcnv and xdcnv to convert between
      the two formats.

See also Constants and Variables.