Iteration
Visual basic supports loops through a series
of statements called looping statements. These statements
can be used to implement repetitive statements.
A loop is a series of one or more statements that
execute more than one time. |
For Loops
The For Loop executes a series of statements a specific
number of times.
For counter = start To end [Step increment]
[statements]
Next [counter]
Where:
- counter is a numeric variable.
- start is the initial value of counter.
- end is the final value of counter.
- step is optional. It is the amount counter is
changed each time through the loop. If not specified,
step defaults to one.
- statements is optional part.
Consider the following program segment:
1: For counter = 1 To 5
2: lblShow.Caption = counter
3: Next
The above loop repeats 5 times. The first time line
"1:" is executed, counter is assigned 1.
The body of the loop executes using that value. Line
'3:" sends the loop to repeat again by incrementing
counter by 1. The loop terminates when the value of
counter becomes greater than 5.
 |
Use the Exit For statement if you
want to terminate a loop before its normal termination. |
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