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modf(3M)		Mathematical Library Functions		      modf(3M)

NAME
       modf, modff, modfl - decompose floating-point number

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double modf(double x, double *iptr);

       float modff(float x, float *iptr);

       long double modfl(long double x, long double *iptr);

DESCRIPTION
       These  functions	 break	the  argument  x  into integral and fractional
       parts, each of which has the same sign as the argument. It  stores  the
       integral	 part  as  a  double  for the modf() function, a float for the
       modff() function, or a long  double  for	 themodfl()  function  in  the
       object pointed to by iptr.

RETURN VALUES
       Upon  successful	 completion,  these  functions return the signed frac‐
       tional part of x.

       If x is NaN, a NaN is returned and *iptr is set to NaN.

       If x is ±Inf, ±0 is returned and *iptr is set to ±Inf.

ERRORS
       No errors are defined.

USAGE
       These functions compute the function result and *iptr such that:

	 a = modf(x, &iptr) ;
	 x == a+*iptr ;

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       frexp(3M), isnan(3M), ldexp(3M), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			      modf(3M)
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