Manpage of MODF

MODF

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

modf, modff, modfl - extract signed integral and fractional values from floating-point number  

SYNOPSIS

#include <math.h>double modf(double x, double *iptr);
float modff(float x, float *iptr);
long double modfl(long double x, long double *iptr);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

modf(), modfl():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 

DESCRIPTION

These functions break the argument xinto an integral part and a fractional part, each of which has the same sign as x. The integral part is stored in the location pointed to by iptr.  

RETURN VALUE

These functions return the fractional part of x.

If xis a NaN, a NaN is returned, and *iptris set to a NaN.

If xis positive infinity (negative infinity), +0 (-0) is returned, and *iptris set to positive infinity (negative infinity).  

ERRORS

No errors occur.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
modf(), modff(), modfl() Thread safetyMT-Safe
 

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

The variant returning doublealso conforms to SVr4, 4.3BSD, C89.  

SEE ALSO

frexp(3), ldexp(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
SEE ALSO

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Time: 22:27:49 GMT, June 20, 2016