date and time created 83/02/11 15:45:08 by rrh

[unix-history] / usr / src / usr.bin / pascal / libpc / ATAN.c

/* Copyright (c) 1982 Regents of the University of California */

static char sccsid[] = "@(#)ATAN.c 1.1 %G%";

#include <math.h>
extern int errno;

double
ATAN(value)
       double  value;
{
       double result;

       errno = 0;
       result = atan(value);
       if (errno != 0) {
               ERROR("Argument %e is out of the domain of atan\n", value);
               return;
       }
       return result;
}