modf man page on OpenDarwin

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```MODF(3)			 BSD Library Functions Manual		       MODF(3)

NAME
modf — return integral and fractional parts

SYNOPSIS
#include <math.h>

double
modf(double value, double *iptr);

float
modff(float value, float *iptr);

DESCRIPTION
The modf() and modff() break value into integral and fractional parts,
each of which has the same sign as the argument.  They return the frac‐
tional part, and store the integral part (as a floating-point number) in
the object pointed to by iptr

SPECIAL VALUES
modf(�infinity, iptr) returns �0 and stores �infinity in the object
pointed to by iptr.

modf(NaN, iptr) returns a NaN and stores a NaN in the object pointed to
by iptr.

frexp(3), ldexp(3), math(3)

STANDARDS
The modf() and modff() functions conform to ISO/IEC 9899:1999(E).

BSD				 July 24, 2003				   BSD
```
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