Learn to Program with Small Basic

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Stick with Your Style ......................................... 48 Let IntelliSense Work for You ................................... 48 Avoid Naming Variables After Methods and Objects .................. 49 Try It Out 4-2 ........................................... 49 Simplifying Expressions. ............................................. 50 Try It Out 4-3 ........................................... 51 Using Variables to Solve Problems ...................................... 51 Try It Out 4-4 ........................................... 52 Two Kinds of Data ................................................. 53 Global Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Try It Out 4-5 ........................................... 54 Programming Challenges ............................................ 54 5 Drawing Shapes with Turtle Graphics 55 Meet the Turtle. ................................................... 55 Moving the Turtle .................................................. 56 Absolute Motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Relative Motion. ............................................ 59 Coloring Your Steps ......................................... 60 Controlling Your Speed ....................................... 61 Try It Out 5-1 ........................................... 61 Introducing the For Loop ............................................. 62 Try It Out 5-2 ........................................... 64 Drawing Regular Polygons ........................................... 64 A Star Is Born .............................................. 65 Try It Out 5-3 ........................................... 66 Creating Polygon Art Using Nested Loops .......................... 67 Try It Out 5-4 ........................................... 68 Endless Graphics ........................................... 69 Try It Out 5-5 ........................................... 70 Programming Challenges ............................................ 70 6 Getting User Input 73 Talking to the Computer ............................................. 74 Your Number, Please? ........................................ 74 Introducing Yourself to Your Computer. ............................ 75 Writing Prompts for Input ...................................... 75 A Moment of Silence, Please (Pause) .............................. 76 Working with User Input ............................................. 77 Converting Fahrenheit to Celsius ................................. 77 Try It Out 6-1 ........................................... 78 Averaging Numbers ......................................... 78 Reading Text .............................................. 79 Try It Out 6-2 ........................................... 80 Programming Challenges ............................................ 81 Contents in Detail ix
7 Empowering Programs with math 83 Exponent Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 SquareRoot() and Good Old Pythagoras ........................... 84 Powerful Powers ............................................ 85 Try It Out 7-1 ........................................... 86 Rounding Methods ................................................. 86 Traditional Rounding ......................................... 87 Rounding to the Nearest Hundredth. .............................. 88 Try It Out 7-2 ........................................... 88 Abs(), Min(), and Max() Methods ....................................... 88 Try It Out 7-3 ........................................... 90 The Remainder() Method. ............................................ 90 Try It Out 7-4 ........................................... 91 Random Numbers ................................................. 92 Try It Out 7-5 ........................................... 92 Trigonometric Methods .............................................. 93 Try It Out 7-6 ........................................... 94 Programming Challenges ............................................ 95 8 Making Decisions with If Statements 97 The If Statement ................................................... 98 Relational Operators ........................................ 100 Try It Out 8-1 .......................................... 101 Complex If Conditions ....................................... 101 Try It Out 8-2 .......................................... 102 Comparing Strings ......................................... 102 The If/Else Statement .............................................. 103 Try It Out 8-3 .......................................... 104 Nested If and If/Else Statements. ...................................... 104 Try It Out 8-4 .......................................... 106 The Goto Statement ............................................... 107 Try It Out 8-5 .......................................... 108 Programming Challenges ........................................... 108 9 Using Decisions to Make Games 111 The If/ElseIf Ladder ............................................... 112 Letter Grades ............................................. 113 The Bug on the Ladder. ...................................... 114 Try It Out 9-1 .......................................... 115 Let’s Get Logical. ................................................. 115 Logical Operators in the Zoo .................................. 116 The And Operator. ......................................... 117 The Or Operator. .......................................... 118 The Cosmic Order of Evaluation ................................ 119 Try It Out 9-2 .......................................... 120 The Shapes Object. ............................................... 120 Try It Out 9-3 .......................................... 122 x 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: Exploring Other Features. .........
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 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
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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
Page 94 and 95:
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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