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IEEE_TEST(3) FreeBSD Library Functions Manual IEEE_TEST(3) NAME logb, logbf, logbl, scalb, scalbf, significand, significandf - IEEE test functions LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double logb(double x); float logbf(float x); long double logbl(long double x); double scalb(double x, double n); float scalbf(float x, float n); double significand(double x); float significandf(float x); DESCRIPTION These functions allow users to test conformance to IEEE Std 754-1985. Their use is otherwise not recommended. logb(x) returns x's exponent n, a signed integer converted to double-precision floating-point. logb(+-infinity) = +infinity; logb(0) = -infinity with a division by zero exception. scalb(x, n) returns x*(2**n) computed by exponent manipulation. significand(x) returns sig, where x := sig * 2**n with 1 <= sig < 2. significand(x) is not defined when x is 0, +-infinity, or NaN. SEE ALSO math(3) STANDARDS IEEE Std 754-1985 FreeBSD 14.1-RELEASE-p8 August 3, 2011 FreeBSD 14.1-RELEASE-p8