Option Strict On
Option Explicit On
Module Life
Private Const GridSize As Integer = 15
Private CurrentState(GridSize, GridSize) As Boolean
Private Const lifeDistribution As Double = 0.3
Private Const defaultGenerations As Integer = 250
Private Const genSwitch As String = "/g:"
Sub Main()
Dim i, numGenerations As Integer
numGenerations = GetNumberOfGenerations()
If numGenerations < 1 Then
'didn't supply Gen Switch, or supplied < 1
Console.WriteLine( _
"Use {0} to indicate desired number of generations", _
genSwitch)
Console.WriteLine( _
" for example GameOfLife.exe {0}3", _
genSwitch)
Console.WriteLine( _
"Generations must be equal to or greater than 1")
Console.WriteLine()
Console.WriteLine( _
"{0} will be used as the default number of generations", _
defaultGenerations)
numGenerations = defaultGenerations
End If
PopulateStartingGrid(CurrentState)
For i = 1 To numGenerations
CurrentState = CalculateNextGeneration(CurrentState)
Console.WriteLine("Generation {0}", i)
PrintGrid(CurrentState)
Next
Console.WriteLine("Game of Life Completed")
Console.ReadLine()
End Sub
Private Sub PopulateStartingGrid(ByRef grid(,) As Boolean)
Dim i, j As Integer
Dim numGenerator As New System.Random()
For i = 0 To GridSize
For j = 0 To GridSize
If numGenerator.NextDouble < lifeDistribution Then
grid(i, j) = True
Else
grid(i, j) = False
End If
Next
Next
End Sub
Private Function CountNeighbors(ByRef grid(,) As Boolean, _
ByVal cellX As Integer, _
ByVal cellY As Integer) As Integer
Dim count As Integer
count = 0
If cellX > 0 And cellY > 0 Then
'if both are > 0 then I can look at
'upper-left, upper, and left cells safely
If grid(cellX - 1, cellY - 1) Then count += 1
If grid(cellX, cellY - 1) Then count += 1
If grid(cellX - 1, cellY) Then count += 1
End If
If cellX < GridSize And cellY < GridSize Then
'if both are < GridSize then I can look at
'lower-right, right, and lower cells safely
If grid(cellX + 1, cellY + 1) Then count += 1
If grid(cellX, cellY + 1) Then count += 1
If grid(cellX + 1, cellY) Then count += 1
End If
If cellX > 0 And cellY < GridSize Then
If grid(cellX - 1, cellY + 1) Then count += 1
End If
If cellX < GridSize And cellY > 0 Then
If grid(cellX + 1, cellY - 1) Then count += 1
End If
Return count
End Function
Private Function CalculateNextGeneration( _
ByRef currentState(,) As Boolean) As Boolean(,)
Dim nextGen(GridSize, GridSize) As Boolean
Dim i, j As Integer
Dim neighbors As Integer
For i = 0 To GridSize
For j = 0 To GridSize
neighbors = CountNeighbors(currentState, i, j)
If neighbors = 2 Or neighbors = 3 Then
If neighbors = 2 Then
nextGen(i, j) = currentState(i, j)
Else
nextGen(i, j) = True
End If
Else
nextGen(i, j) = False
End If
Next
Next
Return nextGen
End Function
Private Sub PrintGrid(ByRef grid(,) As Boolean)
Dim i, j As Integer
Console.WriteLine()
For i = 0 To GridSize
Console.Write("*")
Next
Console.WriteLine()
For i = 0 To GridSize
For j = 0 To GridSize
If grid(i, j) Then
Console.Write("X")
Else
Console.Write(" ")
End If
Next
Console.WriteLine()
Next
End Sub
Private Function GetNumberOfGenerations() As Integer
Dim args() As String
Dim arg As String
args = System.Environment.GetCommandLineArgs()
For Each arg In args
If arg.StartsWith(genSwitch) Then
Return ParseGenSwitch(arg)
End If
Next
End Function
Private Function ParseGenSwitch(ByVal switch As String) As Integer
Dim tmp As String
tmp = switch.Substring(genSwitch.Length)
Try
Return Integer.Parse(tmp)
Catch e As Exception
Return -1
End Try
End Function
End Module Write, Run & Share VB.net code online using OneCompiler's VB.net online compiler for free. It's one of the robust, feature-rich online compilers for VB.net language, running on the latest version 16. Getting started with the OneCompiler's VB.net compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as VB.net. OneCompiler also has reference programs, where you can look for the sample code to get started with.
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Public Module Program
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End Module
Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.
Variable is a name given to the storage area in order to identify them in our programs.
Simple syntax of Variable declaration is as follows
Dim variableName [ As [ New ] dataType ] [ = initializer ]
variableName = value
If condition-expression Then
'code
End If
If(conditional-expression)Then
'code if the conditional-expression is true
Else
'code if the conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
Else If(conditional-expression) Then
'code if the above conditional-expression is true
Else
'code if the above conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
If(conditional-expression)Then
'code if the above conditional-expression is true
End If
End If
Select [ Case ] expression
[ Case expressionlist
'code ]
[ Case Else
'code ]
End Select
For counter [ As datatype ] = begin To end [ Step step ]
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ counter ]
For Each element [ As datatype ] In group
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ element ]
While conditional-expression
'Code
[ Continue While ]
'Code
[ Exit While ]
'Code
End While
Do { While | Until } conditional-expression
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop
Do
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop { While | Until } conditional-expression
Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Procedures are of two types.
Functions return a value when they are called.
[accessModifiers] Function functionName [(parameterList)] As returnType
'code
End Function
Sub-procedures are similar to functions but they don't return any value.
Sub ProcedureName (parameterList)
'Code
End Sub