TISHITU Visual Basic 6.0 For loop Explain Part-1
Tishitu explains
For-Next Loops
In situations where you merely want to run the loop a predefined number of times, it can become quite tiresome to have to create and manage a counter for each loop, which is why we also have something called a For-Next Loop. This kind of loop allows you to specify a counter, to tell it to count from one number to another each time through the loop, and to exit once the counter has reached its upper limit. The syntax is as follow:
Dim I As Integer
For I = (Integer) To (Integer)
(Code to execute)
Next I
We used the variable name "I" above, as it is the most common name used for For-Loops; however, you can use any variable name you want, so long as the variable is of the type Integer. Now, let's improve our Fibonacci program even further:
Public Sub Main()
Dim X As Integer
Dim Y As Integer
Dim cnt As Integer 'Our counter.
For cnt = 1 To 8
Debug.Print X
X = Y + X
Y = X - Y
Loop
End Sub
In the example above, we first dimensioned cnt as an Integer, and then, in the declaration of the For-Next loop, set its value to 1. Each time through the loop, the value of cnt was incremented by 1 until it reached 8, at which point the loop was executed.
Exit For
As with Do Loops, there is a statement that can be used to exit a For-Next loop, and it is called Exit For. Simply invoke this statement anywhere within a For-Next loop and the current loop will be exited.
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