Learn to Program with Small Basic

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integrated development environment (IDE), 4–6 defined, 4 Editor, 4 Help Area, 5 Surface, 5 Toolbar, 5 IntelliSense, 9 naming variables, 48–49 interactive programs, 73 IsArray() method, 232–233 IsArray.sb, 232 IsSubText() method, 265 iteration statements, 97 J JackHouse_Incomplete.sb, 281 JoinNum.sb, 18 JoinString.sb, 18 .jpg files, 289 jump statements, 97 K KeyDown event handler, 153 KeyDown.sb, 152–154 keywords, 9 KnockKnock.sb, 54 L labels, 107 LandArea.sb, 131 LastClickedButton property, 170 library, 4 lines, drawing, 28–29 Lines.sb, 186 LinkedIn, 227 LoadImage() method, 191 logical expressions, 99 logical operators, 115–120 logic errors, 25 LogicError.sb, 53 LoginName.sb, 297 lookup tables, 228 loops, 98 accumulator, 184–185 control variables, 183 counter, 183 defined, 107 infinite, 199–200 iteration of, 182 For loops. See For loops nested, 67–68, 189–190 Step size, 187 terminal value of, 182 While, 195–205 M machine language, 2 MagicBall.sb, 217–218 Magician.sb, 81 MakeLine1() subroutine, 238 MakeLine2() subroutine, 238 MakeLine3() subroutine, 238 maps, 208, 228 math, 17–18 Math object, 83. See also numbers Abs() method, 88–89 Ceiling() method, 86–87 exponent methods, 84–86 Floor() method, 86–88 GetRandomNumber() method, 92, 125 Max() method, 88–89 Min() method, 88–89 Power() method, 85–86 Remainder() method, 90–91 rounding methods, 86–88 Round() method, 78, 86–88 SquareRoot() method, 84–85 trigonometric methods, 93–94 math operators, 83 Math.Round() method, 78, 133 Math Wizard program, 302–304 Max() method, 88–89 Maze_Incomplete.sb, 163 methods, 7, 15 passing variables to, 45 Min() method, 88–89 misspelled words, 277–278 MoeMows.sb, 231–232 Money.sb, 90 MouseDown event, 152, 154, 157, 173, 201 MouseMove event, 155–156, 157 MouseUp event, 157 MouseX property, 152, 156 MouseY property, 152, 156 MoveApples() subroutine, 221–222 MoveKnight() subroutine, 143–144 Move() method, 56, 60, 62–63, 121–122, 246 MoveTo() method, 57–58 Index 313
MovingWord.sb, 184 .mp3 files, 289 multiline strings, 272–273 multiple nesting, 191–192 N naming programs, 8 nested If/Else statements, 104–106 nested If statements, 104–106 nested loops, 67–68, 189–190 NestedLoops.sb, 189–190 nested subroutines, 135–137 nesting, 189 NewGame() subroutine, 141, 255–256 NewRound() subroutine, 160–161 not equal operator (), 101 Notepad, 291 numbers, 53. See also Math object averaging, 78–79 displaying, 17–18 random, 92 reading, 74 O objects Array, 232–235 Controls, 166–169 File, 291–301 GraphicsWindow, 10, 28, 60, 133 ImageList, 191 Math. See Math object properties of, 18–19 Shapes, 120–122, 159, 246 Text. See Text object TextWindow, 7, 15, 16, 20 Okla.sb, 260–261 OnButtonClicked() subroutine, 168, 170, 237–238, 258–260, 282–283 OnGameOver() subroutine, 161 OnKeyDown() subroutine, 153, 159, 160 OnMouseDown() subroutine, 152, 157, 173, 174, 201, 202 OnMouseMove() subroutine, 156, 170 OnTextTyped() subroutine, 175 OnTick handler, 159, 160 opening files, 5 operands, 22, 101–102, 117 operators arithmetic, 22–23 relational, 100–101, 120 OrDemo.sb, 119 Or operator, 118–119 output files, 288 P palindromes, 274–275 Palindrome.sb, 275 ParallelLines.sb, 28 pathname, 290 Pause() method, 76–77, 144 PauseWithoutMessage() method, 77 .pdb (program database) files, 8 .pdf files, 289 pen, 34–35 PenColor property, 60, 170 PenDown() method, 56 PentaStar.sb, 65–66 PenUp() method, 56 PenWidthDemo.sb, 34–35 PenWidth property, 60 PepperDare.sb, 136–137 persistent data, 288 Pick() subroutine, 136 pig latin, 276 PigLatin.sb, 276 Pinball.sb, 223–224 Poet.sb, 235–239 CreateLists() subroutine, 301 graphical user interface, 237 MakeLine1() subroutine, 238 MakeLine2() subroutine, 238 MakeLine3() subroutine, 238 OnButtonClicked() subroutine, 237–238 startup file, 236, 302 polling, 202 polygon art, 67–68 PolygonArt.sb, 69 polygons, drawing, 64–70 Polygon.sb, 65 PowerDemo.sb, 85 Power() method, 85–86 ProcessChoice() subroutine, 143 program database (.pdb) files, 8 programmers, 2 programming errors, 24–25 logic errors, 25 runtime errors, 25 syntax errors, 24 programs compiling, 6 naming, 8 314 Index
Page 1 and 2:
Learn to Program with Small Basic A
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Learn to Program with Small Basic A
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Brief Contents Foreword by Vijaye R
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Exploring Other Features. .........
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7 Empowering Programs with math 83
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12 building Graphical User Interfac
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Storing Records. ..................
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Foreword Computer programming is ma
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Acknowledgments This book represent
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Introduction Have you ever wondered
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• In Chapter 11: Event-Driven Pro
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1 Introducing Small Basic Bill Gate
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BASIC language that would help kids
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Toolbar Help Area Editor Surface Fi
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Then click the New button to open a
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Helping Hands: IntelliSense and Syn
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Programming Challenges If you get s
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The Parts of a Program Let’s expl
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The method’s name and a brief des
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5 + 7 12 Here’s the output of thi
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For example, to make the TextWindow
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TRY IT OUT 2-3 Now you have a chanc
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Programming Errors Just because a p
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26 Chapter 2 4. Write a program tha
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In the system you use at school, po
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Drawing Shapes You can draw lots of
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Figure 3-6 shows what the output lo
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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
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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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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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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
Page 289 and 290: (both uppercase and lowercase), dig
Page 291 and 292: Taking Strings Apart: Substrings Ju
Page 293 and 294: two arguments: the source string th
Page 295 and 296: Here’s an output example: Who's y
Page 297 and 298: More on Code Points The Unicode cod
Page 299 and 300: Line 7 gets the Nth character of th
Page 301 and 302: Igpay Atinlay Let’s teach the com
Page 303 and 304: 17 TextWindow.WriteLine("Good Job!"
Page 305 and 306: 9 pos = Math.GetRandomNumber(len) '
Page 307 and 308: When you continue with the second a
Page 309 and 310: TRY IT OUT 18-10 Use the techniques
Page 312 and 313: 19 Receiving File Input and Output
Page 314 and 315: and their meanings. File extensions
Page 316 and 317: program’s folder (right-click the
Page 318 and 319: in the file would run together in o
Page 320 and 321: Let’s experiment with the first p
Page 322 and 323: line number. As with the WriteLine(
Page 324 and 325: WARNING If the destination path poi
Page 326 and 327: 6 For N = 1 To count ' Displays the
Page 328 and 329: wizard asks the user to perform. Th
Page 330 and 331: Figure 19-8 shows a sample run of t
Page 332 and 333: Where to Go from Here So you’ve m
Page 334 and 335: Index Numbers and Symbols 3DArrayDe
Page 336 and 337: squares, 31-32 star, 65-66 triangle
Page 340 and 341: parts of, 14-16 publishing, 5-6 run
Page 342 and 343: NewGame() subroutine, 255-256 OnBut
Page 344: ages 10 and up “Welcome to the ma
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