What is the operator precedence order in Visual Basic 6.0?

StackOverflow https://stackoverflow.com/questions/55206

  •  09-06-2019
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Question

What is the operator precedence order in Visual Basic 6.0 (VB6)?

In particular, for the logical operators.

Was it helpful?

Solution

Arithmetic Operation Precedence Order

  1. ^
  2. - (unary negation)
  3. *, /
  4. \
  5. Mod
  6. +, - (binary addition/subtraction)
  7. &

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 — Appendix A: Operator Precedence

OTHER TIPS

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 VB6 manual topic Operator Precedence. Unfortunately this topic doesn't seem to be in the MSDN online VB6 manual, so I will paste the logical operator information here. If you installed the VB6 help (the MSDN library) you will have it on your machine.

Logical operators are evaluated in the following order of precedence:

Not   
And   
Or   
Xor   
Eqv   
Imp

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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