[Mono-devel-list] Bug? in (float) ToString

[yoros at wanadoo.es]

On Sun, May 04, 2003 at 10:19:24AM -0500, Burton M. Strauss III wrote:
> The results of ToString() (explicit or implicit) on double values isn't what
> I would expect.  Mono seems to be ignoring the format specifier and using
> "G":
> 
> using System;
> public class test {
>         public static void Main() {
> // Expected values per
> //
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm
> l/cpconstandardnumericformatstrings.asp
> // F or f Fixed-point The number is converted to a string of the form
> "-ddd.ddd..." where
> //        each 'd' indicates a digit (0-9). The string starts with a minus
> sign if the
> //        number is negative. The precision specifier indicates the desired
> number of
> //        decimal places. If the precision specifier is omitted, the default
> numeric
> //        precision given by the NumberFormatInfo is used.
>                 Console.WriteLine("F2:");
>                 Console.WriteLine("Expected 2.00: {0:F2}", 2.0);
>                 Console.WriteLine("Expected 2.00: {0:F2}",
> 2.0.ToString("#0.00"));
>                 Console.WriteLine("Expected 2.01: {0:F2}", 2.01);
>                 Console.WriteLine("Expected 2.02: {0:F2}", 2.015);
>                 Console.WriteLine("#0.00:");
>                 Console.WriteLine("Expected 2.00: {0:#0.00}", 2.0);
>                 Console.WriteLine("Expected 2.01: {0:#0.00}", 2.01);
>                 Console.WriteLine("Expected 2.02: {0:#0.00}", 2.015);
>                 Console.WriteLine("Explicit:");
>                 Console.WriteLine("Expected 2.00: {0:F2}",
> 2.0.ToString("#0.00"));
>         }
> }
> 
> F2:
> Expected 2.00: 2
> Expected 2.00: 2
> Expected 2.01: 2.01
> Expected 2.02: 2.015
> #0.00:
> Expected 2.00: 2
> Expected 2.01: 2.01
> Expected 2.02: 2.015
> Explicit:
> Expected 2.00: 2
> 
> 
> Or, maybe I'm crazy.

That bug is not in float formatter (I think so). Try to use:

    Console.WriteLine(2.00.ToString("F2");

The bug may be in String.Format that should call X.ToString("F2") when
{0:F2} is in the format string.

Please, test it in MS.NET and file a bug in bugzilla.ximian.com (corlib)
so we have enough information to fix it.

Regards,

    Pedro

-- 
Pedro Martínez Juliá
\  yoros at terra.es
)|    yoros at wanadoo.es
/        http://yoros.cjb.net
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