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From: aburto@marlin.UUCP
Newsgroups: net.micro.amiga
Subject: Re: Followup:  Aztec - good, bad, help.
Message-ID: <629@marlin.UUCP>
Date: Thu, 5-Jun-86 11:05:06 EDT
Article-I.D.: marlin.629
Posted: Thu Jun  5 11:05:06 1986
Date-Received: Sat, 7-Jun-86 06:21:38 EDT
References: <296@bucsb.bu.edu.UUCP> <379@sask.UUCP>
Reply-To: aburto@marlin.UUCP (Alfred A. aburto)
Organization: Naval Ocean Systems Center, San Diego
Lines: 60

In article <379@sask.UUCP> hardie@sask.UUCP writes:
>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

Newsgroups: net.micro.amiga
Subject: Re: Followup:  Aztec - good, bad, help.
Summary: 
Expires: 
References: <296@bucsb.bu.edu.UUCP> <379@sask.UUCP>
Sender: 
Reply-To: aburto@marlin.UUCP (Alfred A. aburto)
Followup-To: 
Distribution: 
Organization: Naval Ocean Systems Center, San Diego
Keywords: 

In article <379@sask.UUCP> hardie@sask.UUCP writes:
>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?
I don't have any ideas about Aztec C but I know that LATTICE V3.02 does not 
compute COS(PI/4) correctly.

AAA