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problem with floating point literal

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problem with floating point literal

Postby jonathandavid » Tue Dec 16, 2008 12:27 pm

The following program does not work

class Test
def main is shared
x = 0.00001f # line 4
print x


I get the error "; expected at line 4"

Seems like a parser problem to me. It works fine if I remove the "f" at the end of the literal, or if I change it to "0.00001f".

Regards,
Manuel
jonathandavid
 
Posts: 159

Re: problem with floating point literal

Postby Charles » Tue Dec 16, 2008 12:47 pm

I assume you meant to say that you changed it to "0.0001f".

The bug is in the code generation which outputs "1E-05.0". This is coming from the .NET library (since Cobra is a .NET language) but apparently is not a format that makes C# happy.

I'm booked for today, so I'll have to fix tomorrow. The temporary workaround is:
x = sharp'0.00001' to float
Charles
 
Posts: 2510
Location: Los Angeles, CA

Re: problem with floating point literal

Postby jonathandavid » Tue Dec 16, 2008 1:13 pm

Chuck wrote:I assume you meant to say that you changed it to "0.0001f".


It's funny, actually I wanted to say '1.00001f'.

BTW my workaround was slightly less efficient :)

x = float.parse('0.00001')
jonathandavid
 
Posts: 159

Re: problem with floating point literal

Postby Charles » Wed Dec 17, 2008 10:11 am

Fixed, tested and checked in.
Charles
 
Posts: 2510
Location: Los Angeles, CA

Re: problem with floating point literal

Postby jonathandavid » Thu Dec 18, 2008 1:23 am

Thanks, works great now.

On a related note, I see that scientific notation (e.g. 1e-10f) is not supported. Chuck: if you want you can open a ticket, I'll take care when I have some spare time.

For anyone that's interested, there is an obvious workaround for this:

x = sharp'10e-10'


Regards,
Manuel
jonathandavid
 
Posts: 159

Re: problem with floating point literal

Postby Charles » Thu Dec 18, 2008 9:23 am

Wow, you really like small numbers. :-)

Yes, I would accept a ticket for sci. notation.
Charles
 
Posts: 2510
Location: Los Angeles, CA

Re: problem with floating point literal

Postby hopscc » Sat Dec 20, 2008 5:18 am

Ticket:103 added for this.
hopscc
 
Posts: 631
Location: New Plymouth, Taranaki, New Zealand

Re: problem with floating point literal

Postby Charles » Sat Dec 20, 2008 1:43 pm

I added comment "Approved." just to make it extra clear that I'll accept patches on this. I guess Trac doesn't have an explicit approval flag on tickets.

Also, I recommend linking to tickets for convenience. ticket:103
Charles
 
Posts: 2510
Location: Los Angeles, CA


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