Microsoft Office Tutorials and References
In Depth Information
Controlling Execution
Looping blocks of instructions
Looping is the process of repeating a block of VBA instructions within a procedure. You may
know the number of times to loop, or it may be determined by the values of variables in your
program. VBA offers a number of looping constructs:
h For-Next loops
h Do While loops
h Do Until loops
For-Next loops
The following is the syntax for a For-Next loop:
For counter = start To end [Step stepval]
[Exit For]
Next [counter]
The following listing is an example of a For-Next loop that does not use the optional Step
value or the optional Exit For statement. This function accepts two arguments and returns the
sum of all integers between (and including) the arguments:
Function SumIntegers(first, last)
total = 0
For num = first To last
total = total + num
Next num
SumIntegers = total
End Function
The following formula, for example, returns 55 — the sum of all integers from 1 to 10:
In this example, num (the loop counter variable) starts out with the same value as the first
variable, and increases by 1 each time the loop repeats. The loop ends when num is equal to the last
variable. The total variable simply accumulates the various values of num as it changes during the
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