mirror of
https://github.com/adambard/learnxinyminutes-docs.git
synced 2024-12-24 01:51:38 +00:00
282 lines
12 KiB
Markdown
282 lines
12 KiB
Markdown
---
|
|
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.
|