opensolaris man page for modf

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 fractional 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)