Learn to Program with Small Basic

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Create a Game: Guess My Coordinates ................................. 122 Step 1: Open the Startup File .................................. 123 Step 2: Set Up the Game ..................................... 123 Step 3: Hide the Star. ....................................... 124 Step 4: Let the User Guess .................................... 126 Try It Out 9-4 .......................................... 127 Programming Challenges ........................................... 127 10 Solving Problems with Subroutines 129 Why Use Subroutines? ............................................. 130 Writing Subroutines ............................................... 130 Try It Out 10-1 ......................................... 133 Subroutine Input and Output ......................................... 133 Try It Out 10-2 ......................................... 135 Nesting Subroutines ............................................... 135 Try It Out 10-3 ......................................... 138 Create a Dragon Game ............................................ 138 Step 1: Open the Startup File .................................. 139 Step 2: Write the SetUp() Subroutine ............................. 140 Step 3: Add a Bit of Chance .................................. 141 Step 4: Let the Player Know What’s Going On ...................... 142 Step 5: Get the Player in the Game with GetChoice() ................. 142 Step 6: Process the Player’s Choice .............................. 143 Step 7: Add Motion with MoveKnight() ........................... 143 Step 8: Shoot Arrows with ShootArrow() .......................... 145 Step 9: Swing the Sword with StabDragon(). ....................... 146 Step 10: Breathe Fire. ....................................... 146 Try It Out 10-4 ......................................... 147 Programming Challenges ........................................... 147 11 Event-Driven Programming 149 GraphicsWindow Events. ........................................... 151 Create Patterns with the MouseDown Event ........................ 151 Try It Out 11-1 ......................................... 152 Fire Missiles with the KeyDown Event. ............................ 152 Try It Out 11-2 ......................................... 154 Make a Typewriter Using the TextInput Event ....................... 154 Try It Out 11-3 ......................................... 155 Draw Pictures with the MouseMove Event. ......................... 155 Try It Out 11-4 ......................................... 156 Useful Tips ..................................................... 157 Create a Gold Rush Game .......................................... 157 Step 1: Open the Startup File .................................. 158 Step 2: Move the Turtle ...................................... 159 Step 3: Move the Bag of Gold ................................. 160 Step 4: Update the User’s Score ................................ 162 Try It Out 11-5 ......................................... 162 Programming Challenges ........................................... 163 Contents in Detail xi
12 building Graphical User Interfaces 165 Design a User Interface with the Controls Object ........................... 166 Step 1: The Design Phase. .................................... 166 Step 2: Program Interactivity. .................................. 168 Try It Out 12-1 ......................................... 169 Make a Colorful Drawing Program. .................................... 169 Try It Out 12-2 ......................................... 171 Explore Circuits with Code .......................................... 171 Step 1: Open the Startup File .................................. 172 Step 2: Add the Main Code ................................... 173 Step 3: Toggle the Switch. .................................... 174 Step 4: Respond to Changes .................................. 175 Step 5: Update the Program’s Interface ........................... 175 Try It Out 12-3 ......................................... 176 Program Your Own Image Viewer ..................................... 176 Try It Out 12-4 ......................................... 178 Programming Challenges ........................................... 178 13 Repeating For Loops 181 The For Loop .................................................... 182 Try It Out 13-1 ......................................... 183 Magical Moving Text. ....................................... 183 Try It Out 13-2 ......................................... 184 Adding ’em Up. ........................................... 184 Try It Out 13-3 ......................................... 185 Formatting Your Output ...................................... 185 Try It Out 13-4 ......................................... 186 Drawing All Kinds of Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Try It Out 13-5 ......................................... 187 Changing the Step Size ............................................ 187 Counting Down by Twos ..................................... 187 Making a Fractional Step. .................................... 188 Try It Out 13-6 ......................................... 188 Nested Loops ................................................... 189 Tessellating for Fun ......................................... 190 Try It Out 13-7 ......................................... 191 Multiple Nesting Levels ...................................... 191 Try It Out 13-8 ......................................... 192 Programming Challenges ........................................... 192 14 Creating Conditional While Loops 195 When to Use While Loops. .......................................... 196 Writing a While Loop. ............................................. 196 Try It Out 14-1 ......................................... 198 Validating Your Inputs ............................................. 198 Try It Out 14-2 ......................................... 199 xii Contents in Detail
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: 7 Empowering Programs with math 83
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 36: Programming Challenges If you get s
Page 39 and 40: The Parts of a Program Let’s expl
Page 41 and 42: The method’s name and a brief des
Page 43 and 44: 5 + 7 12 Here’s the output of thi
Page 45 and 46: For example, to make the TextWindow
Page 47 and 48: TRY IT OUT 2-3 Now you have a chanc
Page 49 and 50: Programming Errors Just because a p
Page 51 and 52: 26 Chapter 2 4. Write a program tha
Page 53 and 54: In the system you use at school, po
Page 55 and 56: Drawing Shapes You can draw lots of
Page 57 and 58: Figure 3-6 shows what the output lo
Page 59 and 60: 22 GraphicsWindow.BrushColor = "Lig
Page 61 and 62: DrawText() takes three arguments. T
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GraphicsWindow provides two methods
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6. Write a program that draws this
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4 Using Variables Have you ever wan
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Try changing the value in karenBear
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These two ways of updating the scor
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Figure 4-2: How a variable is added
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TRY IT OUT 4-3 Write a program that
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Two Kinds of Data Programs use all
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5 Drawing Shapes with Turtle Graphi
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Absolute Motion With absolute motio
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North 0 (360) 315 (-45) 45 (-315) W
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GraphicsWindow.PenColor = "Red" Gra
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The For loop runs Turtle.Move(60) a
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y 5). For the hexagon (the polygon
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Creating Polygon Art Using Nested L
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Endless Graphics In Listing 5-10 yo
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Write a program to have the turtle
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Talking to the Computer Until now,
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Figure 6-2: The text window waiting
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4 C = (5 / 9) * (F - 32) 5 C = Math
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9 noun = TextWindow.Read() 10 11 Te
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7 Empowering Programs with Math If
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Here’s a sample run of our progra
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Round() -4 -3.5 -3 0 3 3.5 4 Round(
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This code snippet shows you some ex
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Let’s walk through this program l
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Trigonometric Methods Trigonometric
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Programming Challenges If you get s
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Small Basic uses a few different wa
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You can test all sorts of condition
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Small Basic first finds the value o
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Your mom’s instructions assume th
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But wait, your mom just realized th
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This code asks the user to enter a
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9 Using Decisions to Make Games Som
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Condition 1 True Statement set 1 If
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This change to the program means th
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Door 1 Door 2 Door 3 Figure 9-6: Pe
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Listing 9-4 shows an example of usi
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Think of the Shapes object as a “
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Background image (Grid.png) Star.pn
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In Figure 9-8, you see that the gri
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This code asks the player to enter
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10 Solving Problems with Subroutine
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Gulliver later learned that 1 glum-
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TRY IT OUT 10-1 When Gulliver asked
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variables that belong to the main p
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4 TextWindow.WriteLine("Your turn.
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1 step away). If the arrow hits the
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Then you set the graphics window’
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24 Shapes.SetText(msgText, "") 25 T
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Step 8: Shoot Arrows with ShootArro
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Lines 3-7 animate the dragon’s fi
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11 Event-Driven Programming So far,
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GraphicsWindow Events Let’s start
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4 5 Sub OnKeyDown 6 GraphicsWindow.
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13 Else 14 GraphicsWindow.DrawText(
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Useful Tips Before moving on, we’
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21 GraphicsWindow.BrushColor = "Red
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4 XG = Math.GetRandomNumber(8) - 1
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Programming Challenges If you get s
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Today, most programs use a graphica
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located at (100, 100). By default,
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9 GraphicsWindow.MouseMove = OnMous
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Let’s look at the computations. Y
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You start by loading the two backgr
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(line 8). If the total resistance i
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TRY IT OUT 12-4 Write a program to
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13 Repeating For Loops Have you eve
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Each For loop starts with the keywo
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The program uses a variable named s
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TRY IT OUT 13-5 What does the follo
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Nested Loops The statements in the
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Figure 13-7: The output of Stamp.sb
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2. Although the pizza in the previo
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In this chapter, you’ll learn how
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Note Although it’s not required b
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asks the user for the correct answe
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to become a value other than 0 (thi
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Step 4: Announce the Winner The las
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15 Grouping Data in One-Dimensional
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One way to think of an array is as
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The string initializer lets you fil
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TextWindow.WriteLine("Enter 5 numbe
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how much money was rescued from eac
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To create this program, we’ll use
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The apples fall from the trees. Usi
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The subroutine uses a For loop to c
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9 If ((xdiff < 20) And (ydiff < 20)
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4. Open the file USMapQuiz_Incomple
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Associative Arrays In the previous
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The expression If("ernie" = "Ernie"
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Here’s the output from a sample r
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The ContainsIndex() method takes tw
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Figure 16-1 shows the user interfac
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1 Sub OnButtonClicked 2 GraphicsWin
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17 Expanding to Higher-Dimension Ar
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1 ' Random2DArray.sb 2 For r = 1 To
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Animated Squares Let’s write a pr
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12 TextWindow.Write("Enter student
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(line 8). Line 9 displays Scott's M
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You start by initializing the sum v
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4 For col = 1 To 4 ' For each colum
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note If you run into any problems,
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First, you set all the elements of
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11 If ((rowP < 1) Or (rowP > 10) Or
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Open the file Okla.sb from this cha
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(both uppercase and lowercase), dig
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Taking Strings Apart: Substrings Ju
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two arguments: the source string th
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Here’s an output example: Who's y
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More on Code Points The Unicode cod
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Line 7 gets the Nth character of th
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Igpay Atinlay Let’s teach the com
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17 TextWindow.WriteLine("Good Job!"
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9 pos = Math.GetRandomNumber(len) '
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When you continue with the second a
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TRY IT OUT 18-10 Use the techniques
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19 Receiving File Input and Output
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and their meanings. File extensions
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program’s folder (right-click the
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in the file would run together in o
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Let’s experiment with the first p
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line number. As with the WriteLine(
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WARNING If the destination path poi
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6 For N = 1 To count ' Displays the
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wizard asks the user to perform. Th
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Figure 19-8 shows a sample run of t
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Where to Go from Here So you’ve m
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Index Numbers and Symbols 3DArrayDe
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squares, 31-32 star, 65-66 triangle
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integrated development environment
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parts of, 14-16 publishing, 5-6 run
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NewGame() subroutine, 255-256 OnBut
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ages 10 and up “Welcome to the ma
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Learn to Program with Small Basic

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