Syntax

expression1 Or expression2

Description

Performs a logical or binary disjunction on two expressions.

Comments

If both expressions are either Boolean, Boolean variants, or Null variants, then a logical disjunction is performed as follows:

If the first
expresionn is

and the
second expression is

then:
the result is

TRUE

TRUE

TRUE

TRUE

FALSE

TRUE

TRUE

NULL

TRUE

FALSE

TRUE

TRUE

FALSE

FALSE

FALSE

FALSE

NULL

NULL

NULL

TRUE

TRUE

NULL

FALSE

NULL

NULL

NULL

NULL

Binary Disjunction

If the two expressions are Integer, then a binary disjunction is performed, returning an Integer result. All other numeric types (including Empty variants) are converted to Long and a binary disjunction is then performed, returning a Long result.

Binary disjunction forms a new value based on a bit-by-bit comparison of the binary representations of the two expressions according to the following table:

1

Or

1

=

1

Example

0

Or

1

=

1

5  10101001

1

Or

0

=

1

6  01101010

0

Or

0

=

0

Or  11101011

Example 1

This first example shows the use of logical Or.

Sub Main()
  temperature_alert = True
  pressure_alert = False
  If temperature_alert Or pressure_alert Then
    MsgBox "You had better run!",ebExclamation,"Nuclear Disaster Imminent"
  End If
End Sub

Example 2

This second example shows the use of binary Or.

Sub Main()
  Dim w As Integer

TryAgain:
  s$ = InputBox("Enter a hex number (four digits max).","Binary Or Example")
  If Mid(s$,1,1) <> "&" Then
    s$ = "&H" & s$
  End If
  If Not IsNumeric(s$) Then Goto TryAgain

  w = Cint(s$)
  MsgBox "Your number is &H" & Hex(w)
  w = w Or &H8000
  MsgBox "Your number with the high bit set is &H" & Hex(w)
End Sub

See Also

Operator Precedence (topic); Xor (operator); Eqv (operator); Imp (operator); And (operator).

O