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diff --git a/visualbasic.html.markdown b/visualbasic.html.markdown new file mode 100644 index 00000000..bdfdcc10 --- /dev/null +++ b/visualbasic.html.markdown @@ -0,0 +1,281 @@ +--- +language: Visual Basic +contributors: + - ["Brian Martin", "http://brianmartin.biz"] +filename: learnvisualbasic.vb +--- + +```vb +Module Module1 + + Sub Main() + ' A Quick Overview of Visual Basic Console Applications before we dive + ' in to the deep end. + ' Apostrophe starts comments. + ' To Navigate this tutorial within the Visual Basic Complier, I've put + ' together a navigation system. + ' This navigation system is explained however as we go deeper into this + ' tutorial, you'll understand what it all means. + Console.Title = ("Learn X in Y Minutes") + Console.WriteLine("NAVIGATION") 'Display + Console.WriteLine("") + Console.ForegroundColor = ConsoleColor.Green + Console.WriteLine("1. Hello World Output") + Console.WriteLine("2. Hello World Input") + Console.WriteLine("3. Calculating Whole Numbers") + Console.WriteLine("4. Calculating Decimal Numbers") + Console.WriteLine("5. Working Calculator") + Console.WriteLine("6. Using Do While Loops") + Console.WriteLine("7. Using For While Loops") + Console.WriteLine("8. Conditional Statements") + Console.WriteLine("9. Select A Drink") + Console.WriteLine("50. About") + Console.WriteLine("Please Choose A Number From The Above List") + Dim selection As String = Console.ReadLine + Select Case selection + Case "1" 'HelloWorld Output + Console.Clear() 'Clears the application and opens the private sub + HelloWorldOutput() 'Name Private Sub, Opens Private Sub + Case "2" 'Hello Input + Console.Clear() + HelloWorldInput() + Case "3" 'Calculating Whole Numbers + Console.Clear() + CalculatingWholeNumbers() + Case "4" 'Calculting Decimal Numbers + Console.Clear() + CalculatingDecimalNumbers() + Case "5" 'Working Calcculator + Console.Clear() + WorkingCalculator() + Case "6" 'Using Do While Loops + Console.Clear() + UsingDoWhileLoops() + Case "7" 'Using For While Loops + Console.Clear() + UsingForLoops() + Case "8" 'Conditional Statements + Console.Clear() + ConditionalStatement() + Case "9" 'If/Else Statement + Console.Clear() + IfElseStatement() 'Select a drink + Case "50" 'About msg box + Console.Clear() + Console.Title = ("Learn X in Y Minutes :: About") + MsgBox("This tutorial is by Brian Martin (@BrianMartinn") + Console.Clear() + Main() + Console.ReadLine() + + End Select + End Sub + + 'One - I'm using numbers to help with the above navigation when I come back + 'later to build it. + + 'We use private subs to seperate different sections of the program. + Private Sub HelloWorldOutput() + 'Title of Console Application + Console.Title = "Hello World Ouput | Learn X in Y Minutes" + 'Use Console.Write("") or Console.WriteLine("") to print outputs. + 'Followed by Console.Read() alternatively Console.Readline() + 'Console.ReadLine() prints the output to the console. + Console.WriteLine("Hello World") + Console.ReadLine() + End Sub + + 'Two + Private Sub HelloWorldInput() + Console.Title = "Hello World YourName | Learn X in Y Minutes" + ' Variables + ' Data entered by a user needs to be stored. + ' Variables also start with a Dim and end with an As VariableType. + + ' In this tutorial, we want to know what your name, and make the program + ' respond to what is said. + Dim username As String + 'We use string as string is a text based variable. + Console.WriteLine("Hello, What is your name? ") 'Ask the user their name. + username = Console.ReadLine() 'Stores the users name. + Console.WriteLine("Hello " + username) 'Output is Hello 'Their name' + Console.ReadLine() 'Outsputs the above. + 'The above will ask you a question followed by printing your answer. + 'Other variables include Integer and we use Integer for whole numbers. + End Sub + + 'Three + Private Sub CalculatingWholeNumbers() + Console.Title = "Calculating Whole Numbers | Learn X in Y Minutes" + Console.Write("First number: ") 'Enter a whole number, 1, 2, 50, 104 ect + Dim a As Integer = Console.ReadLine() + Console.Write("Second number: ") 'Enter second whole number. + Dim b As Integer = Console.ReadLine() + Dim c As Integer = a + b + Console.WriteLine(c) + Console.ReadLine() + 'The above is a simple calculator + End Sub + + 'Four + Private Sub CalculatingDecimalNumbers() + Console.Title = "Calculating with Double | Learn X in Y Minutes" + 'Of course we would like to be able to add up decimals. + 'Therefore we could change the above from Integer to Double. + + 'Enter a whole number, 1.2, 2.4, 50.1, 104.9 ect + Console.Write("First number: ") + Dim a As Double = Console.ReadLine + Console.Write("Second number: ") 'Enter second whole number. + Dim b As Double = Console.ReadLine + Dim c As Double = a + b + Console.WriteLine(c) + Console.ReadLine() + 'Therefore the above program can add up 1.1 - 2.2 + End Sub + + 'Five + Private Sub WorkingCalculator() + Console.Title = "The Working Calculator| Learn X in Y Minutes" + 'However if you'd like the calculator to subtract, divide, multiple and + 'add up. + 'Copy and paste the above again. + Console.Write("First number: ") + Dim a As Double = Console.ReadLine + Console.Write("Second number: ") 'Enter second whole number. + Dim b As Integer = Console.ReadLine + Dim c As Integer = a + b + Dim d As Integer = a * b + Dim e As Integer = a - b + Dim f As Integer = a / b + + 'By adding the below lines we are able to calculate the subtract, + 'multply as well as divide the a and b values + Console.Write(a.ToString() + " + " + b.ToString()) + 'We want to pad the answers to the left by 3 spaces. + Console.WriteLine(" = " + c.ToString.PadLeft(3)) + Console.Write(a.ToString() + " * " + b.ToString()) + Console.WriteLine(" = " + d.ToString.PadLeft(3)) + Console.Write(a.ToString() + " - " + b.ToString()) + Console.WriteLine(" = " + e.ToString.PadLeft(3)) + Console.Write(a.ToString() + " / " + b.ToString()) + Console.WriteLine(" = " + f.ToString.PadLeft(3)) + Console.ReadLine() + + End Sub + + 'Six + Private Sub UsingDoWhileLoops() + 'Just as the previous private sub + 'This Time We Ask If The User Wishes To Continue (Yes or No?) + 'We're using Do While Loop as we're unsure if the user wants to use the + 'program more than once. + Console.Title = "UsingDoWhileLoops | Learn X in Y Minutes" + Dim answer As String 'We use the variable "String" as the answer is text + Do 'We start the program with + Console.Write("First number: ") + Dim a As Double = Console.ReadLine + Console.Write("Second number: ") + Dim b As Integer = Console.ReadLine + Dim c As Integer = a + b + Dim d As Integer = a * b + Dim e As Integer = a - b + Dim f As Integer = a / b + + Console.Write(a.ToString() + " + " + b.ToString()) + Console.WriteLine(" = " + c.ToString.PadLeft(3)) + Console.Write(a.ToString() + " * " + b.ToString()) + Console.WriteLine(" = " + d.ToString.PadLeft(3)) + Console.Write(a.ToString() + " - " + b.ToString()) + Console.WriteLine(" = " + e.ToString.PadLeft(3)) + Console.Write(a.ToString() + " / " + b.ToString()) + Console.WriteLine(" = " + f.ToString.PadLeft(3)) + Console.ReadLine() + 'Ask the question, does the user wish to continue? Unfortunately it + 'is case sensitive. + Console.Write("Would you like to continue? (yes / no)") + 'The program grabs the variable and prints and starts again. + answer = Console.ReadLine + 'The command for the variable to work would be in this case "yes" + Loop While answer = "yes" + + End Sub + + 'Seven + Private Sub UsingForLoops() + 'Sometimes the program only needs to run once. + 'In this program we'll be counting down from 10. + + Console.Title = "Using For Loops | Learn X in Y Minutes" + 'Declare Variable and what number it should count down in Step -1, + 'Step -2, Step -3 ect. + For i As Integer = 10 To 0 Step -1 + Console.WriteLine(i.ToString) 'Print the value of the counter + Next i 'Calculate new value + Console.WriteLine("Start") 'Lets start the program baby!! + Console.ReadLine() 'POW!! - Perhaps I got a little excited then :) + End Sub + + 'Eight + Private Sub ConditionalStatement() + Console.Title = "Conditional Statements | Learn X in Y Minutes" + Dim userName As String = Console.ReadLine + Console.WriteLine("Hello, What is your name? ") 'Ask the user their name. + userName = Console.ReadLine() 'Stores the users name. + If userName = "Adam" Then + Console.WriteLine("Hello Adam") + Console.WriteLine("Thanks for creating this useful site") + Console.ReadLine() + Else + Console.WriteLine("Hello " + userName) + Console.WriteLine("Have you checked out www.learnxinyminutes.com") + Console.ReadLine() 'Ends and prints the above statement. + End If + End Sub + + 'Nine + Private Sub IfElseStatement() + Console.Title = "If / Else Statement | Learn X in Y Minutes" + 'Sometimes it is important to consider more than two alternatives. + 'Sometimes there are a good few others. + 'When this is the case, more than one if statement would be required. + 'An if statement is great for vending machines. Where the user enters a code. + 'A1, A2, A3, ect to select an item. + 'All choices can be combined into a single if statement. + + Dim selection As String = Console.ReadLine 'Value for selection + Console.WriteLine("A1. for 7Up") + Console.WriteLine("A2. for Fanta") + Console.WriteLine("A3. for Dr. Pepper") + Console.WriteLine("A4. for Diet Coke") + Console.ReadLine() + If selection = "A1" Then + Console.WriteLine("7up") + Console.ReadLine() + ElseIf selection = "A2" Then + Console.WriteLine("fanta") + Console.ReadLine() + ElseIf selection = "A3" Then + Console.WriteLine("dr. pepper") + Console.ReadLine() + ElseIf selection = "A4" Then + Console.WriteLine("diet coke") + Console.ReadLine() + Else + Console.WriteLine("Please select a product") + Console.ReadLine() + End If + + End Sub + +End Module + +``` + +## References + +I learnt Visual Basic in the console application. It allowed me to understand the principles of computer programming to go on to learn other programming languages easily. + +I created a more indepth <a href="http://www.vbbootcamp.co.uk/" Title="Visual Basic Tutorial">Visual Basic tutorial</a> for those who would like to learn more. + +The entire syntax is valid. Copy the and paste in to the Visual Basic compiler and run (F5) the program. |