floor(3M)               LIBRARY FUNCTIONS               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 in-
     teger 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  argu-



                                                                1

floor(3M)               LIBRARY FUNCTIONS               floor(3M)



     ment  and the rounded result is exactly 0.5, then the result
     will be rounded to the nearest even integer.

     remainder returns the floating point remainder of the  divi-
     sion  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 the standard
     error output. Except under -Xc,  these  error-handling  pro-
     cedures may be changed with the function matherr.





































                                                                2