Exponent computation bug

[fafalone]

Describe the bug
Thought I'd offer a more detailed analysis of the exponent bug reported by Ever on Discord. There's very serious issues with computing exponents in a fairly normal circumstance.

VB6 0 ^ (1 - 1) = 1 0 ^ (2 - 1) = 0 0 ^ (3 - 1) = 0 1 ^ (1 - 1) = 1 1 ^ (2 - 1) = 1 1 ^ (3 - 1) = 1 2 ^ (1 - 1) = 1 2 ^ (2 - 1) = 2 2 ^ (3 - 1) = 4 3 ^ (1 - 1) = 1 3 ^ (2 - 1) = 3 3 ^ (3 - 1) = 9 4 ^ (1 - 1) = 1 4 ^ (2 - 1) = 4 4 ^ (3 - 1) = 16 5 ^ (1 - 1) = 1 5 ^ (2 - 1) = 5 5 ^ (3 - 1) = 25

twinBASIC 0 ^ (1 - 1) = 1 0 ^ (2 - 1) = 1 0 ^ (3 - 1) = 1 1 ^ (1 - 1) = 0 1 ^ (2 - 1) = 1 1 ^ (3 - 1) = 2 2 ^ (1 - 1) = 0 2 ^ (2 - 1) = 1 2 ^ (3 - 1) = 4 3 ^ (1 - 1) = 0 3 ^ (2 - 1) = 1 3 ^ (3 - 1) = 8 4 ^ (1 - 1) = 0 4 ^ (2 - 1) = 1 4 ^ (3 - 1) = 16 5 ^ (1 - 1) = 0 5 ^ (2 - 1) = 1 5 ^ (3 - 1) = 32

VB gives the expected values, but tB values make no sense at all. 3^2 = 8, 4^=16, 5^2 = 32?? Ever suggest parsing was reversed; but that doesn't explain it either; 5^-2 is 0.04, not 32.

To Reproduce

Dim fizz As Long
Dim buzz As Long

Dim i As Long, j As Long
For i = 0 To 5
    For j = 1 To 3
        fizz = i: buzz = j
        Debug.Print i & " ^ (" & j & " - 1) = " & fizz ^ (buzz - 1)
    Next j
Next i

Expected behavior
Values should match VB6.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 10
• twinBASIC compiler version 0.15.423

Additional context
Weird this bug has gone unnoticed until now.

[EduardoVB]

I think it is doing the opposite operation:
1^0 is doing 0^1 and 5^2 is doing 2^5

[fafalone]

Ah yes that kind of reversal explains it, good catch.

[fafalone]

Issue confirmed still present in 426.

[WaynePhillipsEA]

Fixed in BETA 427. Thanks!