Man page - modfl(3)

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Manual

modf

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

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

LIBRARY

Math library ( libm , -lm )

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 );

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

modff (), modfl ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

These functions break the argument x into 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 x is a NaN, a NaN is returned, and *iptr is set to a NaN.

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

ERRORS

No errors occur.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

C11, POSIX.1-2008.

HISTORY

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

frexp (3), ldexp (3)