Learn to Program with Small Basic

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parts of, 14–16 publishing, 5–6 running, 5–6 terminating, 21 writing and running, 6–9 prompts, 75–76 properties setting and changing, 19–20 working with, 20–21 Properties.sb, 20–21 pseudocode, 52, 248 publishing programs, 5–6 Q quotation marks, 272 R Race_Incomplete.sb, 204–205 Raji, Vijaye, xvii–xviii, 2–3 Random2DArray.sb, 243 random matrix, 243–244 random numbers, 92 random selection, 216–217 RandomSelect.sb, 217 readability, 47 ReadContentsDemo.sb, 291–292 ReadContents() method, 291–292 reading numbers, 74 text, 79–80 ReadLine() method, 296 Read() method, 75, 269 ReadNumber() method, 74, 75, 76 registering, event handlers, 152 relational operators, 100–101, 120 relative motion, 59–60 Remainder() method, 90–91 Rock-Paper-Scissors game, 200–204 announcing winner in, 204 game setup, 201–202 MouseDown handler, 202–203 switching images in, 203 root directory, 290 RotatedPolygon.sb, 67 rounding methods, 86–88 Round() method, 78, 86–88 running sum, 79 running programs, 5–6 runtime errors, 25 S SailBoat.sb, 29 saving files, 5 records in arrays, 216 Scribble2.sb, 169–170 Scribble.sb, 156 SeaWorld_Incomplete.sb, 179 selection statements, 97 semiperimeter, 134 sequential execution, 17 SeriesCircuit.sb, 173–176 main code, 172–174 OnMouseDown() subroutine, 174 OnTextTyped() subroutine, 175 startup file, 172 toggling switch in, 174 UpdateUserInterface() subroutine, 174, 175–176 updating interface, 175–176 SetApplePosition() subroutine, 221 SetSize() method, 167–168 SetTextBoxText(), 169 SetText() routine, 258 SetTurtle.sb, 54 SetUp() subroutine, 139–140 shapes, drawing, 30–35, 120–122 circles, 32–34 ellipses, 32–34 polygons, 64–70 rectangles, 31–32 squares, 31–32 star, 65–66 triangles, 30 Shapes object, 120–122, 159, 246 sharing files, 5 ShootArrow() subroutine, 145 Shoot_Incomplete.sb, 284 ShowLocation() subroutine, 256, 257–258 Show() method, 57 ShowWinner() subroutine, 202, 204 Silly.sb, 79–80 SimpleSlot.sb, 205 Sin() method, 94 slash sign (/), 83 Small Basic blog, 3, 308 forum, 5, 14, 308 goals of, 3 history of, 2–3 Index 315
Small Basic, continued integrated development environment. See integrated development environment (IDE) language, 3 library, 4 parts of, 3–4 website, 4, 308 Small Basic folder, creating, 6 SnarfPizza2.sb, 103 SnarfPizza3.sb, 105 SnarfPizza4.sb, 106 SnarfPizza.sb, 98 software, 2 source code, 8, 14–15, 74 spaces, using for readability, 47 Space.sb, 205 spaghetti code, 107 special characters, counting, 273–274 Speed property, 61 spelling, 277–278 Square1.sb, 62 Square2.sb, 62–63 SquareRootDemo.sb, 84 SquareRoot() method, 84–85 SquareTable.sb, 185–186 StabDragon() subroutine, 146 Stamp.sb, 190–191 stars, drawing, 65–66 StartsWith() method, 266 statements, 14–15 Step size, 187–188 string indices, 246–247 strings, 9, 15 appending, 264–265 comparing, 102–103 counting special characters, 273–274 defined, 263 initializing, 210–211 joining, 18–19 length of, 265 multiline, 272–273 substrings, 266–268 structured programming, 129 StudentAvg2.sb, 248–249 StudentAvg.sb, 246–247 subdirectory, 289 subroutines, 129–148 defined, 129–130 input, 132–133 nesting, 135–137 output, 132–133 using, 130 writing, 131–132 subscripted variables, 209 substrings, 266–268 Sum.sb, 184 Surface, 5 SwitchImages() subroutine, 203 syntax coloring, 9 syntax errors, 3, 24 syntax rules, 3 T Tan() method, 94 terminating programs, 21 tesselation, 190–191 text drawing, 35–37 reading, 79–80 TextAndNum.sb, 17 text-based user interface, 9 TextInput event, 154–155 Text object, 264–273 Append() method, 264–265 ConvertToLowerCase() method, 268–269 ConvertToUpperCase() method, 268–269 EndsWith() method, 266 GetCharacterCode() method, 270 GetCharacter() method, 270 GetIndexOf() method, 268 GetLength() method, 265, 270 GetSubText() method, 267 GetSubTextToEnd() method, 267–268 IsSubText() method, 265 methods, 264 StartsWith() method, 266 TextTyped event, 171 text window, 7 TextWindow object, 7, 15, 16, 20 three-dimensional arrays, 252–253 ThreeLines.sb, 17 TicTacToe_Incomplete.sb, 261 To keyword, 63 Toolbar, 5 TotalSales() subroutine, 250–251 Treasure Map game, 253–260 CreateNewMap() subroutine, 256–257 DrawObject() subroutine, 257 316 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 338 and 339: integrated development environment
Page 342 and 343: NewGame() subroutine, 255-256 OnBut
Page 344: ages 10 and up “Welcome to the ma
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