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What is the operator precedence order in Visual Basic 6.0?


Arithmetic Operation Precedence Order

  1. ^
  2. - (unary negation)
  3. *, /
  4. Mod
  5. +, - (binary addition/subtraction)
  6. &

Comparison Operation Precedence Order

  1. =
  2. <>
  3. <
  4. >
  5. <=
  6. >=
  7. Like, Is

Logical Operation Precedence Order

  1. Not
  2. And
  3. Or
  4. Xor
  5. Eqv
  6. Imp

Source: Sams Teach Yourself Visual Basic 6 in 24 Hours โ€” Appendix A: Operator Precedence

It depends on whether or not you’re in the debugger. Really. Well, sort of.

Parentheses come first, of course. Then arithmateic (+,-,*,/, etc). Then comparisons (>, <, =, etc). Then the logical operators. The trick is the order of execution within a given precedence level is not defined. Given the following expression:

If A < B And B < C Then

you are guaranteed the < inequality operators will both be evaluated before the logical And comparison. But you are not guaranteed which inequality comparison will be executed first.

IIRC, the debugger executes left to right, but the compiled application executes right to left. I could have them backwards (it’s been a long time), but the important thing is they’re different. The actual precedence doesn’t change, but the order of execution might.

Use parentheses

EDIT: That’s my advice for new code! But Oscar is reading someone else’s code, so must figure it out somehow. I suggest the VBA manual topic Operator Precedence. VBA is 99% equivalent to VB6 – and expression evaluation is 100% equivalent. I have pasted the logical operator information here.

Logical operators are evaluated in the following order of precedence:


The topic also explains precedence for comparison and arithmetic operators.

I would suggest once you have figured out the precendence, you put in parentheses unless there is some good reason not to edit the code.

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