ILOGB(3) Linux Programmer's Manual ILOGB(3)[top]NAMEilogb, ilogbf, ilogbl - get integer exponent of a floating-point valueSYNOPSIS#include <math.h> int ilogb(double x); int ilogbf(float x); int ilogbl(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): ilogb(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 ilogbf(), ilogbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99-lm.DESCRIPTIONThese functions return the exponent part of their argument as a signed integer. When no error occurs, these functions are equivalent to the corresponding logb(3) functions, cast to int.RETURN VALUEOn success, these functions return the exponent of x, as a signed inte‐ ger. If x is zero, then a domain error occurs, and the functions return FP_ILOGB0. If x is a NaN, then a domain error occurs, and the functions return FP_ILOGBNAN. If x is negative infinity or positive infinity, then a domain error occurs, and the functions return INT_MAX.ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is 0 or a NaN An invalid floating-point exception (FE_INVALID) is raised. These functions do not set errno for this case. Domain error: x is an infinity These functions do not set errno or raise an exception for this case.ATTRIBUTESMultithreading (see pthreads(7)) The ilogb(), ilogbf(), and ilogbl() functions are thread-safe.CONFORMING TOC99, POSIX.1-2001.SEE ALSOlog(3), logb(3), significand(3)COLOPHONThis page is part of release 3.54 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2013-08-06 ILOGB(3)

List of man pages available for

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]

Polar

Member of Polar

Based on Fawad Halim's script.

....................................................................

Vote for polarhome |