Manpages - 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).

These functions are nonstandard; the double version is available on a number of other systems.

*ilogb*(3), *scalb*(3)

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