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NetBSD 6.1.5 - man page for remainderf (netbsd section 3)

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REMAINDER(3)			   BSD Library Functions Manual 		     REMAINDER(3)

NAME
     remainder, remainderf, remquo, remquof -- remainder functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     remainder(double x, double y);

     float
     remainderf(float x, float y);

     double
     remquo(double x, double y, int *quo);

     float
     remquof(float x, float y, int *quo);

DESCRIPTION
     Provided that y != 0 , the remainder() and remainderf() functions calculate the floating-
     point remainder r of

	   r = x - ny,

     where n is the integral value nearest to the exact value of x / y.  If

	   | n - x / y | = 1/2 ,

     the value n is chosen to be even.	Consequently, the remainder is computed exactly and | r |
     <= | y | / 2 .

     Also the remquo() and remquof() functions calculate the remainder as described above.  But
     these additionally use quo to store a value whose sign is the sign of x / y and whose magni-
     tude is congruent modulo 2^k to the magnitude of the integral quotient of x / y, where k is
     an implementation-defined integer greater than or equal to 3.

     The rationale of the remquo() family of functions relates to situations where only few bits
     of the quotient are required.  The exact representation of the quotient may not be meaning-
     ful when x is large in magnitude compared to y.

RETURN VALUES
     The functions return the remainder independent of the rounding mode.  If y is zero , NaN is
     returned and a domain error occurs.  A domain error occurs and a NaN is returned also when x
     is infinite but y is not a NaN.  If either x or y is NaN, a NaN is always returned.

SEE ALSO
     div(3), fast_remainder32(3), fmod(3), math(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD					September 18, 2011				      BSD
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