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.

SEE ALSO
     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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