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0 Command: logb | Section: 3 | Source: OpenBSD | File: logb.3
LOGB(3) FreeBSD Library Functions Manual LOGB(3) NAME logb, logbf, logbl, scalb, scalbf, scalbl, significand, significandf - IEEE test functions 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); long double scalbl(long double x, long double 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 not otherwise 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. logbf() is the single precision form of logb(). logbl() is the extended precision form of logb(). scalb(x, n) returns x*(2**n) computed by exponent manipulation. scalbf() is the single precision form of scalb(). scalbl() is the extended precision form of scalb(). 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. significandf() is the single precision for of significand(). SEE ALSO fpclassify(3), ilogb(3), scalbn(3) STANDARDS IEEE Std 754-1985 FreeBSD 14.1-RELEASE-p8 April 26, 2016 FreeBSD 14.1-RELEASE-p8

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