PRB: Print Function Evaluation Order Has Changed

MORE INFORMATION

Steps to Reproduce Behavior

1. Start Visual Basic.
2. On the File menu, click New Project.
3. Double-click the command button box on the toolbar (symbolized by a shaded oval). This will display a command button named Command1 on the form.
4. Add the following code to the general declarations section of Form1:

         Function Test(N As Integer) As Integer
            N = N + 1
            Test = N
         End Function
   						

5. Add the following code to the command buttons click event:

         Sub Command1_Click()
            Dim M As Integer
            M = 1
            Form1.Print M, Test(M), M, Test(M)
         End Sub
   						

6. On the Run menu, click start (ALT, R, S) or press the F5 key.

The following chart illustrates the behavior of this program under Visual Basic 3.0 and Visual Basic 4.0:

                       Print M    Test(M)    M    Test(M)

Visual Basic 3.0         1          2          2     3
Visual Basic 4.0         3          2          3     3
				

Visual Basic 3.0 evaluates functions while processing the Print statement. Because Visual Basic 4.0 uses Visual Basic for Applications, all functions are evaluated first, before any printing is done.