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SIGNIFICAND(3) Linux Programmer's Manual SIGNIFICAND(3) NAME significand, significandf, significandl - get mantissa of floating-point number SYNOPSIS #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 DESCRIPTION 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. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βsignificand(), significandf(), significandl() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO These functions are nonstandard; the double version is available on a number of other systems. SEE ALSO ilogb(3), scalb(3) GNU 2021-03-22 SIGNIFICAND(3)