OpenEuphoria

Re: Undocumented "printf()" funnies

• Posted by "Juergen Luethje" <j.lue at gmx.de> Feb 04, 2005
• 453 views

Alan Oxley wrote:

> Hi, some observations with Eu 2.5a:

Eu 2.5 beta has been released some time ago!

> If you leave out the "%" symbol in a printf, then its not an error,
> you simply get the string within the quotes printed. Would it not be better
> to either document this, or have euphoria return "Unknown printf format"
> as it does if you tried printf(1,"%k",0) Where "%k" is the rubbish demo.

I agree. A more specific error message would be even better, e.g.:
"No % character found in the format string."

> Most incorrect formatting attempt within the printf quotes is not picked up
> by initial parsing, only at execution time. Since you cannot use variables
> within the quotes, there is no reason not to have this parsed?
>
> Attempting to use two decimal places is also unsupported,

Hm???

> but it does not give a parse error, but simply a strange result:
>
> }}}
<eucode>
> atom a
> a = 100000001
> printf(1,"%3.3.3d",a)
> </eucode>
{{{


That's a strange format string, so you get a strange result. 
As far as I can see, this format string does not correspond to the
documentation.
And it certainly is *not* the proper format string for two decimal
places. Use e.g. the following to display two decimal places:

atom a
a = 12345.678
printf(1, "%8.2f", {a})

<snip>

Regards,
   Juergen

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