# ilogb(3) [centos man page]

ILOGB(3) Linux Programmer's Manual ILOGB(3)NAME

ilogb, 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-lm.ilogbf(), ilogbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc-std=c99-std=c99DESCRIPTION

These 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 VALUE

On success, these functions return the exponent of x, as a signed integer. 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.ERRORS

See 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.CONFORMING TO

C99, POSIX.1-2001.SEE ALSO

log(3), logb(3), significand(3)COLOPHON

This page is part of release 3.53 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/. 2010-09-20 ILOGB(3)

## Check Out this Related Man Page

ILOGB(3) Linux Programmer's Manual ILOGB(3)NAME

ilogb, 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-lm.ilogbf(), ilogbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc-std=c99-std=c99DESCRIPTION

These 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 VALUE

On success, these functions return the exponent of x, as a signed integer. 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.ERRORS

See 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.CONFORMING TO

C99, POSIX.1-2001.SEE ALSO

log(3), logb(3), significand(3)COLOPHON

This page is part of release 3.44 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/. 2010-09-20 ILOGB(3)