Learn to Program with Small Basic

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Programming Challenges If you get stuck, check out http://nostarch.com/smallbasic/ for the solutions and for more resources and review questions for teachers and students. 1. Identify the objects, methods, arguments, and keywords in the following code snippet. (Hint: the Small Basic editor shows keywords in blue-purple.) If (today = "Friday") Then TextWindow.WriteLine("Today is Friday.") Else TextWindow.WriteLine("I lost track of what day it is.") EndIf 2. Write a program to display your name in the text window. 3. Write a program to display your name in a message box using the GraphicsWindow object. (Hint: use the ShowMessage() method.) Introducing Small Basic 11
Page 1 and 2: Learn to Program with Small Basic A
Page 4 and 5: Learn to Program with Small Basic A
Page 6: Brief Contents Foreword by Vijaye R
Page 9 and 10: Exploring Other Features. .........
Page 11 and 12: 7 Empowering Programs with math 83
Page 13 and 14: 12 building Graphical User Interfac
Page 15 and 16: Storing Records. ..................
Page 18 and 19: Foreword Computer programming is ma
Page 20 and 21: Acknowledgments This book represent
Page 22 and 23: Introduction Have you ever wondered
Page 24 and 25: • In Chapter 11: Event-Driven Pro
Page 26 and 27: 1 Introducing Small Basic Bill Gate
Page 28 and 29: BASIC language that would help kids
Page 30 and 31: Toolbar Help Area Editor Surface Fi
Page 32 and 33: Then click the New button to open a
Page 34 and 35: Helping Hands: IntelliSense and Syn
Page 38 and 39: 2 Getting Started Now we’ll walk
Page 40 and 41: careful not to use too many comment
Page 42 and 43: application. But you should get int
Page 44 and 45: String Number TextWindow.WriteLine(
Page 46 and 47: TextWindow.CursorLeft = 4 TextWindo
Page 48 and 49: 15, or multiply 6 times the sum of
Page 50 and 51: Logic Errors Sometimes, you might m
Page 52 and 53: 3 Drawing Basics With Small Basic y
Page 54 and 55: second line to the right, at the (1
Page 56 and 57: Rectangles and Squares Using the Dr
Page 58 and 59: (x, y) Height Width Figure 3-8: The
Page 60 and 61: 6 GraphicsWindow.DrawEllipse(20, 20
Page 62 and 63: By layering text on top of other te
Page 64 and 65: Programming Challenges If you get s
Page 66: 10. Write a program that draws the
Page 69 and 70: What’s a Variable? A variable is
Page 71 and 72: Changing the Value of a Variable Wh
Page 73 and 74: 3. Variable names in Small Basic ar
Page 75 and 76: Simplifying Expressions Variables c
Page 77 and 78: Now that you’ve defined your prob
Page 79 and 80: Note Most other programming languag
Page 81 and 82: Figure 5-1: Hello, turtle! You migh
Page 83 and 84: 1 ' MoveTo.sb 2 Turtle.Show() 3 Pro
Page 85 and 86: Turtle.Show() Turtle.Move(150) Turt
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Introducing the For Loop As you sta
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NOTE Programmers usually use one-le
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If the turn angle is 144 instead of
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epeatCount = 4 repeatCount = 6 repe
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Using triangle with repeatCount = 1
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6 Getting User Input To perform use
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Introducing Yourself to Your Comput
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5 TextWindow.Pause() 6 7 TextWindow
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15 25 Average = 17.5 The program pr
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Programming Challenges If you get s
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To use any of the Math object metho
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Run the program to see how much mon
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Rounding to the Nearest Hundredth L
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TRY IT OUT 7-3 Your favorite potato
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Random Numbers Random numbers are u
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After the prompt, the program reads
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8 Making Decisions with If Statemen
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Small Basic automatically indents I
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But what if the applicant also need
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Did it work this time? Yep! The rea
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If (condition1) Then Statement(s) I
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The Goto Statement The Goto stateme
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2. Captain James P. Cork is pilotin
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statements. We’ll also introduce
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12 Else 13 grade = "F" 14 EndIf 15
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thingie And thingie is true only if
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1 ' AndDemo.sb 2 TextWindow.Write("
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This code finds A = 1 Or B = 1 firs
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Line 4 calls the Move() method to m
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11 path = Program.Directory ' Progr
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window. To do this, you add 12 to X
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128 Chapter 9 3. Obi-Wan Kenobi nee
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Subroutines are basic building bloc
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on line 5 means “run the subrouti
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1 ' LandArea.sb 2 ' Calculates the
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To try out this concept, you’ll p
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TRY IT OUT 10-3 Play the Pepper Dar
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Next, you’ll work on the subrouti
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Step 4: Let the Player Know What’
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6 7 If (dist = 0) Then ' Checks whe
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Step 9: Swing the Sword with StabDr
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have your main program call DrawHea
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y the operating system (see Figure
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GraphicsWindow.MouseDown = OnMouseD
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5. The KeyDown event is raised cont
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1 ' Scribble.sb 2 GraphicsWindow.Mo
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60 120 180 240 300 360 420 480 60 1
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12 Shapes.Move(player, XP * 60, YP
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Step 4: Update the User’s Score T
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12 Building Graphical User Interfac
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Hello there, Alpaca Bag! Start Smal
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firstName variable (line 16). This
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TRY IT OUT 12-2 You can change the
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40 80 120 160 200 240 280 320 360 4
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Step 4: Respond to Changes Add the
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Note You’ll need Small Basic vers
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2. In this exercise, you’ll creat
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The For Loop Let’s say you want t
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1 ' MovingWord.sb 2 For N = 0 To 40
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9 TextWindow.CursorLeft = 14 ' Move
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Here’s the output: 10 8 6 4 2 0 M
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3 j = 1 c 1 1 2 3 j = 4 c 2 2 c j =
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15 EndFor 16 EndFor 17 EndFor Listi
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14 Creating Conditional While Loops
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This piece of code simply says, “
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Tip Make sure you initialize any va
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Images P1, P2, and P3 show the play
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TIP If you want to find out the exa
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2. Open the file SimpleSlot.sb from
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eferenced using a string index, suc
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This line of code adds five to the
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Constant Initialization The followi
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Here’s the output of this loop: a
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TRY IT OUT 15-4 Write a program tha
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3 ans[2] = "It is decidedly so. By
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20 numMissed = 0 ' Missed apples 21
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7 CheckCatch() ' Checks if the appl
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and bounces to the left or to the r
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16 Storing Data with Associative Ar
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Let’s look at some sample runs of
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TRY IT OUT 16-1 What’s the output
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This code uses the Array object’s
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6 For N = 1 To Array.GetItemCount(n
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Step 2: Set Up the Graphical User I
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TRY IT OUT 16-4 Run your poet progr
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The arrays you’ll make in this ch
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Following along with this figure, w
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To move the square, we call the Mov
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Going Interactive Let’s explore h
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Duckberg Industries December Sales
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TRY IT OUT 17-5 Donald wants to rev
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Forest Rain btnN btnE btnS btnW Flo
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8 ShowLocation() ' Gives feedback t
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Step 6: Show the Player’s Locatio
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We mentioned that the old compass h
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18 Advanced Text Magic Although pic
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Earlier in the book, you learned ho
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The GetSubText() Method To extract
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3 lwrCase = Text.ConvertToLowerCase
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a: 97 b: 98 1: 49 2: 50 Fancy Chara
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Armed with the knowledge you’ve g
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sixth digits, and so on. If any two
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TRY IT OUT 18-7 Write a program tha
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Listing 18-9 shows the main part of
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Page1 This is the House that Jack b
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Lines 2-8 set up the GraphicsWindow
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Complete the GetInput() subroutine,
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In most programming languages, work
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The filesystem has a tree structure
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5 TextWindow.WriteLine(str) 6 TextW
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output file (line 16). If the file
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When you run this program, it creat
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To keep the code simple, we didn’
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WARNING When you call DeleteDirecto
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We automatically load the contents
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16 TextWindow.WriteLine("The game w
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2. Write a science quiz that tests
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Review Questions Test your knowledg
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C CaptainCork_ Incomplete.sb, 109 c
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Format Program, 99 FrenchDay.sb, 23
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MovingWord.sb, 184 .mp3 files, 289
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Small Basic, continued integrated d
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Updates Visit http://nostarch.com/s
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Learn to Program with Small Basic

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