Will the scope of floating point variables affect their values?

Question

If we execute the following C# code on a console application, we will get a message as The sums are Not equal.

If we execute it after uncommenting the l

Answer 1

(Not a real answer but hopefully some supporting documentation)

Configuration: Core i7, Windows 8.1, Visual Studio 2013

Platform x86:

Version      Optimized Code?        Debugger Enabled?          Outcome
4.5.1        Yes                    No                         Not equal
4.5.1        Yes                    Yes                        Equal
4.5.1        No                     No                         Equal
4.5.1        No                     Yes                        Equal
2.0          Yes                    No                         Not Equal
2.0          Yes                    Yes                        Equal
2.0          No                     No                         Equal
2.0          No                     Yes                        Equal

Platform x64:

Version      Optimized Code?        Debugger Enabled?          Outcome
4.5.1        Yes                    No                         Equal
4.5.1        Yes                    Yes                        Equal
4.5.1        No                     No                         Equal
4.5.1        No                     Yes                        Equal
2.0          Yes                    No                         Equal
2.0          Yes                    Yes                        Equal
2.0          No                     No                         Equal
2.0          No                     Yes                        Equal

The situation only seems to occur with optimized code on x86 configurations.