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SIGNIFICAND(3) Linux Programmer's Manual SIGNIFICAND(3)
significand, significandf, significandl - get mantissa of floating-point number
#include <math.h> double significand(double x); float significandf(float x); long double significandl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): significand(), significandf(), significandl(): /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the mantissa of x scaled to the range [1,2). They are equivalent to scalb(x, (double) -ilogb(x)) This function exists mainly for use in certain standardized tests for IEEE 754 conformance.
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │significand(), significandf(), │ Thread safety │ MT-Safe │ │significandl() │ │ │ └──────────────────────────────────────┴───────────────┴─────────┘
These functions are nonstandard; the double version is available on a number of other systems.
ilogb(3), scalb(3)
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