double < 0

uga237 · Joined: 15 May 2012 Posts: 32

Dim test as double

test = 12345

IF test < 0 then 'some time fail
.
.
.

IF test < 0.0 then 'work good
.
.
.

why?

(BASCOM-AVR version : 2.0.7.7 )

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

0 and 0.0 are the same and will give the same result. if you compile 2 different samples and compare the output you will find they are (binary) identical.
so please produce a sample that demonstrates this problem.
Or send a sample/code to support.

six1 · Joined: 27 Feb 2009 Posts: 553

http://wiki.mcselec.com/bavr/Language_Fundamentals/#Floating-Point_Complications

uga237 · Joined: 15 May 2012 Posts: 32

http://wiki.mcselec.com/bavr/Language_Fundamentals/#Floating-Point_Complications - and?

six1 · Joined: 27 Feb 2009 Posts: 553

Hi,
in my mind, you didn't understand, that in binary system you can not show all possible floatingpoint numbers.
Read the help and think about.

regards, michael

uga237 · Joined: 15 May 2012 Posts: 32

Michael.
You don't understand my question about compare Double and Zero.
Think about.

Ivan.

six1 · Joined: 27 Feb 2009 Posts: 553

ahh, ok... that can be the solution...
i do not understand and therefore your code doesn't work... Laughing

You ask about precision and have doubt about my skill?

Maybe you better start debug and have a look for what exactliy going on in your micro...

best, michael

uga237 · Joined: 15 May 2012 Posts: 32

You ask about precision and have doubt about my skill? - no

Some time positive double value lower then Zero.
Why precision?

my code is very big size. i try simulate this on small code and post here.

And sorri my english ) I am from Russia.

P. S. ..and have doubt about my skill?.. - i smile )))