[Mono-bugs] [Bug 444678] New: Unary minus works incorrectly for local float constant with "f" suffix

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=444678


           Summary: Unary minus works incorrectly for local float constant
                    with "f" suffix
           Product: Mono: Compilers
           Version: 2.0
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Minor
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: the.real.andeeee at googlemail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Other


Under mcs/gmcs 2.0.1.0, the value of a local float constant appears to change
if the constant is used with a unary minus in an expression anywhere in the
code. For example:-

using System;

public class ConstTest {

        public static void Main() {
                const float num = 2f;
                Console.WriteLine("{0}, {1}", num, -num);
        }
}

I would expect this code to output "2, -2", but I actually get "-2, -2". It is
as if the value of the constant changes when a unary minus is applied anywhere
within the constant's scope. I have found the same result with graphical code
that doesn't use Console.WriteLine or any other string formatting routine - it
definitely seems to be the value itself that is incorrect.

Strangely, the problem does not occur for doubles or ints or non-constant
floats, and it only happens when the "f" suffix is used at the end of the float
literal. Also, it only seems to affect constants declared locally within a
function; those declared in the main body of the class work as expected.


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