Get mantissa of floating-point number
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():
_SVID_SOURCE || _BSD_SOURCE
The significand() function returns the mantissa of x scaled to the range [1,2). It is equivalent to
scalb(x, (double) -ilogb(x))
This function exists mainly for use in certain standardized tests for IEEE 754 conformance.
These functions are nonstandard; the double version is available on a number of other systems.
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