Microsoft Office Tutorials and References
In Depth Information
Using Arrays
Table 24-2: VBA Logical Operators
Operator
What It Does
Not
Performs a logical negation on an expression
And
Performs a logical conjunction on two expressions
Or
Performs a logical disjunction on two expressions
Xor
Performs a logical exclusion on two expressions
Eqv
Performs a logical equivalence on two expressions
Imp
Performs a logical implication on two expressions
The order of precedence for operators in VBA exactly matches that in Excel. Of course, you can
add parentheses to change the natural order of precedence.
The negation operator (a minus sign) is handled differently in VBA. In Excel, the
following formula returns 25:
=–5^2
In VBA, x equals –25 after this statement is executed:
x = –5 ^ 2
VBA performs the exponentiation operation first, and then applies the negation
operator. The following statement returns 25:
x = (–5) ^ 2
Using Arrays
An array is a group of elements of the same type that have a common name; you refer to a
specific element in the array by using the array name and an index number. For example, you may
define an array of 12 string variables so that each variable corresponds to the name of a different
month. If you name the array MonthNames , you can refer to the first element of the array as
MonthNames(0) , the second element as MonthNames(1) , and so on, up to MonthNames(11) .
Declaring an array
You declare an array with a Dim or Public statement just as you declare a regular variable. You
also can specify the number of elements in the array. You do so by specifying the first index
number, the keyword To , and the last index number — all inside parentheses. For example, here’s how
to declare an array comprising exactly 100 numbers (of data type Long):
 
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