Learn to Program with Small Basic

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Index Numbers and Symbols 3DArrayDemo.sb, 252–253 = (assignment operator), 44 * (asterisk), 83 + (concatenation operator), 18–19, 83 (not equal operator), 101 / (slash sign), 83 A Abs() method, 88–89 absolute motion, 57–59 absolute path, 290 accumulators, 79 accumulator loops, 184–185 AddApples() subroutine, 220–221 AddButton() method, 167 AddImage() method, 121 AddMultiLineTextBox() method, 167 AddRectangle() method, 120, 245 AddTutor.sb, 199 algorithm, 52 AlienAttack.sb, 112 AndDemo.sb, 118 And operator, 117–118 AndroidAttack.sb, 93 Angle property, 58–59 AnimatedSquares.sb, 245–246 Animate() method, 246 Animate() subroutine, 137 AppendContentsDemo.sb, 295 AppendContents() method, 295–296 Append() method, 264–265 ArcCos() method, 94 ArcSin() method, 94 ArcTan() method, 94 arguments, 7, 15 arithmetic expressions, 45 calculating, 50 arithmetic operators, 21, 120 Array object, 232–235 arrays, 207–225 associative. See associative arrays defined, 205 displaying, 213–214 elements, 209 filling with For loops, 211–213 indexed, 207, 208–209, 216–218 initializing, 210–211 processing, 214–215 saving records, 216 string values in, 215 three-dimensional, 252–253 two-dimensional, 241–251 variables, 208 assignment operator (=), 44 assignment statements, 44 associative arrays, 207–208, 227–239. See also arrays; indexed arrays defined, 228 vs. If/ElseIf ladder, 229 using, 230–232 AssociativeArray.sb, 228 asterisk (*), 83 Average1.sb, 208 Avg1.sb, 78–79 Avg2.sb, 79 B BackgroundColor property, 21 BadPath.sb, 295 banker’s rounding, 87 BASIC language, 2–3 BinaryToDecimal_Incomplete.sb, 284–285 Boole, George, 99 Boolean expressions, 99 Boolean operators, 115–120 BoundTextDemo.sb, 37 Brin, David, 2 BrushColor property, 245 bugs, 25 ButtonClicked event handler, 168, 169, 177, 237
C CaptainCork_ Incomplete.sb, 109 case sensitivity, 16–17 Catch Apples game, 219–223 AddApples() subroutine, 220–221 CheckCatch() subroutine, 222–223 MoveApples() subroutine, 221–222 SetApplePosition() subroutine, 221 startup file, 219–220 Ceiling() method, 86–87 Celsius, converting Fahrenheit to, 77–78 characters, 15 CheckCatch() subroutine, 222–223 CheckTouch() subroutine, 160, 162 CircleArea3.sb, 76 CircleArea.sb, 52, 74 Circles.sb, 151–152 Clear() method, 21 code blocks, 98 CoinsAdder.sb, 191–192 ColumnSum() subroutine, 251 comments, 14–15 comparison operators, 100 compiler, 16–17 compiling, 6 complex If conditions, 101–102 compound condition, 115 computers, 1–2 concatenation, 18 concatenation operator (+), 18–19, 83 conditional expressions, 99 conditional transfers, 107 ContainsIndex() method, 235 ContainsIndex.sb, 233 ContainsValue() method, 235 ContainsValue.sb, 235 Controls object, 166–169 ConvertToLowerCase() method, 268–269 ConvertToUpperCase() method, 268–269 coordinates, 28 CopyFile() method, 298–299 copying and pasting, 6 Cos() method, 94 CountDown.sb, 187 counters, 63, 64 CreateDirectory() method, 299 CreateLists() subroutine, 237, 301 CreateNewMap() subroutine, 256–257 cumulative tales, 280 current directory, 290 CursorLeft property, 183–184 D data types, 53 .dat files, 289 debugging, 25 decimal numbers, 53 decisions, 112–128 And operator, 117–118 If/ElseIf ladder, 112–115 logical (Boolean) operators, 115–120 Or operator, 118–119 default case, 113 Delay() method, 57 DeleteDirectory() method, 299–300 DeleteFile() method, 299 dictionaries, 228 directories, 289. See also files creating, 299 deleting, 299–300 listing, 300–301 .dll (dynamic link library) files, 8 DoPuzzle() subroutine, 304 dot notation, 15 DragonFire() subroutine, 146–147 Dragon.sb (game), 138–147 DragonFire() subroutine, 146–147 GameOver() subroutine, 144 GetChoice() subroutine, 142–143 MoveKnight() subroutine, 143–144 NewGame() subroutine, 141 Pause() method, 144 ProcessChoice() subroutine, 143 SetUp() subroutine, 139–140 ShootArrow() subroutine, 145 StabDragon() subroutine, 146 startup file, 139 UpdateUserInterface() subroutine, 142 DrawBoundText() method, 37 DrawEllipse() method, 32–34 drawing 9–10 lines, 28–29 shapes, 30–35, 120–122 circles, 32–34 ellipses, 32–34 polygons, 64–70 rectangles, 31–32 310 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
Page 284 and 285: 11 If ((rowP < 1) Or (rowP > 10) Or
Page 286: 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 336 and 337: squares, 31-32 star, 65-66 triangle
Page 338 and 339: integrated development environment
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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Learn to Program with Small Basic

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