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VB.Net - Nested Loops
VB.Net allows using one loop inside another loop. Following section shows few examples to illustrate the concept.
Syntax
The syntax for a nested For loop statement in VB.Net is as follows −
For counter1 [ As datatype1 ] = start1 To end1 [ Step step1 ] For counter2 [ As datatype2 ] = start2 To end2 [ Step step2 ] ... Next [ counter2 ] Next [ counter 1]
The syntax for a nested While loop statement in VB.Net is as follows −
While condition1 While condition2 ... End While End While
The syntax for a nested Do...While loop statement in VB.Net is as follows −
Do { While | Until } condition1 Do { While | Until } condition2 ... Loop Loop
A final note on loop nesting is that you can put any type of loop inside of any other type of loop. For example, a for loop can be inside a while loop or vice versa.
Example
The following program uses a nested for loop to find the prime numbers from 2 to 100 −
Module loops Sub Main() ' local variable definition Dim i, j As Integer For i = 2 To 100 For j = 2 To i ' if factor found, not prime If ((i Mod j) = 0) Then Exit For End If Next j If (j > (i \ j)) Then Console.WriteLine("{0} is prime", i) End If Next i Console.ReadLine() End Sub End Module
When the above code is compiled and executed, it produces the following result −
2 is prime 3 is prime 5 is prime 7 is prime 11 is prime 13 is prime 17 is prime 19 is prime 23 is prime 29 is prime 31 is prime 37 is prime 41 is prime 43 is prime 47 is prime 53 is prime 59 is prime 61 is prime 67 is prime 71 is prime 73 is prime 79 is prime 83 is prime 89 is prime 97 is prime
vb.net_loops.htm
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