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From: zaccone@psuvax1.UUCP (Rick Zaccone)
Newsgroups: net.micro.mac
Subject: Aztec C problem with pow() and exp(), and a fix
Message-ID: <2310@psuvax1.UUCP>
Date: Sun, 19-Oct-86 11:12:03 EDT
Article-I.D.: psuvax1.2310
Posted: Sun Oct 19 11:12:03 1986
Date-Received: Tue, 21-Oct-86 22:32:42 EDT
Distribution: net
Organization: Pennsylvania State Univ.
Lines: 64


The following tests were done with version 1.06H.1 of the Manx Aztec C
compiler. The compilations were done

cc test.c
ln test.o -lm -lc

Here are the problems.
-----------------------------------------------------------------------
The function exp() does not work properly.  Condiser the following
example:
     
#include <math.h>
#include <stdio.h>
main()
{
        double x,z;
     
        printf("Enter x: ");
        scanf("%E", &x);
        z = exp(x);
        printf("exp(x) is %f:n", z);
}
     
Here are two sample runs with this program:
Enter x: 1
exp(x) is 2.330483   [Correct answer is 2.718281828]
     
Enter x: 10
exp(x) is 18988.393529   [Correct answer is  22026.465]
     
Note that is problem also manifests itself in pow().  Consider the
following program:
     
#include <math.h>
#include <stdio.h>
main()
{
        double x,y,z;
     
        printf("Enter x: ");
        scanf("%E", &x);
        printf("Enter y: ");
        scanf("%E", &y);
        z = pow(x, y);
        printf("z is %f:n", z);
}
Enter x: 1.25
Enter y: 15
z is 30.158702   [Correct answer is 28.4217]

-----------------------------------------------------------------------
Manx claims that pow() and exp() "were not created properly".
     
To correct the problem extract the sources for exp() and pow() from
math.arc using arcv.  Recompile them, and install them into m.lib
using libutil.  I'm not sure if there is a problem in any of the other
math libraries.  The above examples will work correctly after
recompiling pow() and exp().

-- 
Rick Zaccone                   Pennsylvania State University
CSNET: zaccone@penn-state      BITNET: zaccone@psuvax1
UUCP:  {akgua,allegra,burdvax,ihnp4}!psuvax1!zaccone