Newsgroups: comp.unix.ultrix
Path: utzoo!utgpu!watserv1!watcgl!idallen
From: "Ian! D. Allen [CGL]" <idallen@watcgl.waterloo.edu>
Subject: Ultrix 4.x rint() not declared anywhere
Message-ID: <1991Mar1.174711.13349@watcgl.waterloo.edu>
Sender: idallen@watcgl.waterloo.edu (Ian! D. Allen [CGL])
Organization: Computer Graphics Laboratory, University of Waterloo, Ontario, Canada
Date: Fri, 1 Mar 1991 17:47:11 GMT
Lines: 45

The Ultrix 4.x rint man page:

     Syntax
          #include <math.h>
     [...]
          double rint(x)
          double x;

The program:

    #include <math.h>
    main()
    {
	double x = rint(0.0);
	printf("%f\n",x);
	return(0);
    }

The output:  4.000000

The lint ("lint i.c -lm"):

    name declared but never used or defined
	matherr     i.c?(147)
    value type used inconsistently
	rint        llib-lm(63) :: i.c(4)
    value type declared inconsistently
	rint        llib-lm(63) :: i.c(4)
    function returns value which is always ignored
	printf

The problem -- no "extern double rint();" in math.h:

    % grep -w rint /usr/include/*.h
    %

The declaration for trunc() is missing; floor() is there but ffloor()
is not; there may be others missing.  The indication to use <math.h>
in the man page is wrong and misleading, since you still have to
declare many of the functions.

Anyone want to type all this onto an SPR form to DEC?
-- 
-IAN! (Ian! D. Allen) idallen@watcgl.uwaterloo.ca idallen@watcgl.waterloo.edu
 [129.97.128.64]  Computer Graphics Lab/University of Waterloo/Ontario/Canada