## NAME

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

## SYNOPSIS

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

*
*## DESCRIPTION

The **modf()** function breaks 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 *iptr*.

## RETURN VALUE

The **modf()** function returns the fractional part of **x**.

## CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899

## SEE ALSO

**frexp**(3), **ldexp**(3)