PRB: VB5 SP2 and SP3 Give Incorrect Floating Point Results

MORE INFORMATION

Steps to Reproduce Behavior

1. Install Visual Basic 5.0 (without Visual Studio 97 Service Packs 2 or 3) on a clean machine.
2. Make a project with two CommandButton and the following code:

         Private Sub Command1_Click()
         Dim K0 As Double, K1 As Double, K2 As Double, N As Double
           K0 = 0.029204
           K1 = -1.0508
           K2 = -0.34226
           N = 0#
           Do While N <= 2.75
             N = N + 0.02
           Loop
           MsgBox -(K1 + 2# * K2 * N) * Exp(K0 + K1 * N + K2 * N ^ 2) - 0.012
         End Sub
   
         Private Sub Command2_Click()
           Dim D As Double
           D = Int(D)
         End Sub
   

3. Run the program in the IDE and click the CommandButtons in the following order:
   
   Command1
   Command2
   Command1
   
   The result of the calculation in each case is: 2.80181002613759E-04.
4. Install Visual Basic 5.0 with the Visual Studio 97 SP2 or SP3, and rerun the program. Note that the result of the calculation is different:
   
   
   1. Prior to clicking Command2: 2.80181002613761E-04
   2. After clicking Command2: 2.80181002613759E-04

Notes

1. Simply setting N to 2.76 does not cause a problem with the calculation; it must be iterated for the problem to occur.
2. Running a compiled EXE seems to give the correct results, but this may be due to different start-up sequences and is no guarantee of repeatable results if the floating point control registers are altered by a DLL or other call.