floor(3M)                UNIX System V(Math Libraries)                floor(3M)


NAME
      floor, floorf, ceil, ceilf, copysign, fmod, fmodf, fabs, fabsf, rint,
      remainder - floor, ceiling, remainder, absolute value functions

SYNOPSIS
      cc [flag ...] file ...  -lm [library ...]

      #include <math.h>

      double floor (double x);

      float floorf (float x);

      double ceil (double x);

      float ceilf (float x);

      double copysign (double x, double y);

      double fmod (double x, double y);

      float fmodf (float x, float y);

      double fabs (double x);

      float fabsf (float x);

      double rint (double x);

      double remainder (double x, double y);

DESCRIPTION
      floor and floorf return the largest integer not greater than x.  ceil and
      ceilf return the smallest integer not less than x.

      copysign returns x but with the sign of y.

      fmod and fmodf return the floating point remainder of the division of x
      by y.  More precisely, they return the number f with the same sign as x,
      such that x = iy + f for some integer i, and | f| <| y|.

      fabs and fabsf return the absolute value of x, | x|.

      rint returns the nearest integer value to its floating point argument x
      as a double-precision floating point number.  The returned value is
      rounded according to the currently set machine rounding mode.  If round-
      to-nearest (the default mode) is set and the difference between the
      function argument and the rounded result is exactly 0.5, then the result
      will be rounded to the nearest even integer.





10/89                                                                    Page 1

floor(3M)                UNIX System V(Math Libraries)                floor(3M)


      remainder returns the floating point remainder of the division of x by y.
      More precisely, it returns the value r = x - yn, where n is the integer
      nearest the exact value x/y.  Whenever | n - x/y| = 1/2, then n is even.

SEE ALSO
      abs(3C), matherr(3M).

DIAGNOSTICS
      fmod and fmodf return x when y is 0 and set errno to EDOM. remainder
      returns NaN when y is 0 and sets errno to EDOM.  In both cases, except in
      compilation modes -Xa or -Xc, a message indicating DOMAIN error is
      printed on standard error. Except under -Xc, these error-handling
      procedures may be changed with the function matherr.









































Page 2                                                                    10/89