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remainder(3)

NAME

     remainder, remainderf -- minimal residue functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     remainder(double x, double y);

     float
     remainderf(float x, float y);

DESCRIPTION

     remainder() and remainderf() return the remainder r := x - n*y where n is
     the integer nearest the exact value of x/y; moreover if |n - x/y| = 1/2
     then n is even.  Consequently the remainder is computed exactly and |r|
     <= |y|/2.	But remainder(x, 0) and remainder(infinity, 0) are invalid
     operations that produce a NaN.

SEE ALSO

     fmod(3), ieee(3), math(3)

STANDARDS

     The remainder() and remainderf() routines conform to ISO/IEC 9899:1999
     (``ISO C99'') and IEEE Std 754-1985.

HISTORY

     The remainder() and remainderf() functions appeared in 4.3BSD and
     FreeBSD 2.0, respectively.

FreeBSD 5.4		       January 26, 2005 		   FreeBSD 5.4

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