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From: hardie@sask.UUCP (Peter Hardie )
Newsgroups: net.micro.amiga
Subject: Re: Followup:  Aztec - good, bad, help.
Message-ID: <379@sask.UUCP>
Date: Tue, 3-Jun-86 14:40:04 EDT
Article-I.D.: sask.379
Posted: Tue Jun  3 14:40:04 1986
Date-Received: Sat, 7-Jun-86 03:42:04 EDT
References: <296@bucsb.bu.edu.UUCP>
Organization: University of Saskatchewan, CANADA
Lines: 22

Has anyone tried out the trig functions and floating point in the Aztec 
compiler? A friend of mine has had a lot of trouble with them. For example,
#define PI 3.1415926525987654321    /* don't worry about the exact value */
main()
{
	printf("%f\n",PI);
}

will print some outrageous value like 0.0922 etc.
but changing only the defined value to 3.14159  will make it print out a
more or less reasonable value.
He also tried out a program I have that generates data for a 'spider' which
is used in satellite tracking. If we use the lattice compiler then it outputs
exactly what my Vax 4.2bsd version prints out. But the Manx version only gets
about half the numbers right, even after we have corrected problems such as the
PI value above.
It appears to me that the sin and cos functions don't work too well near
PI/2 but I haven't looked into it real hard.
Any ideas?
Tnx
Pete 
ihnp4!sask!hardie