Learn to Program with Small Basic

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This code asks the player to enter the x-coordinate of the star, and it waits for an answer (lines 1–2). Then it checks whether the x-coordinate guess is correct (line 3). If the answer is incorrect, the program moves to line 12 to display the correct coordinates of the star (see the box labeled 2nd Round in Figure 9-8). But if the x-coordinate guess is correct, the code asks the player to enter the y-coordinate of the star and waits for an answer (lines 4–5). If the player answers correctly (line 7), the program displays Good Job! You're a star!. If not, the program moves to line 9 to display the correct coordinates. In all these cases, the program ends up at line 15 to display an empty line, and the While loop repeats for another round of the game. The game never ends! (This is exactly how your parents feel when you’re playing video games.) The game is now complete. Try playing it now! Try It Out 9-4 Change Listing 9-8 to ask the player to enter the x- and y-coordinates, and then use the And operator to check xAns and yAns in a single If statement. Programming Challenges If you get stuck, check out http://nostarch.com/smallbasic/ for the solutions and for more resources and review questions for teachers and students. 1. A love meter gives a number from 1 to 5 that indicates the warmth of your heart (a lower number is warmer). Write a program that asks the user to input their love indicator number and then displays one of these messages: 1: Your heart is lava hot! 2: Your heart is warm. 3: Your heart is neutral. 4: Your heart is cold, like the North Pole! 5: If your heart was a movie, it would be Frozen! 2. Write a program to simulate a mouse’s search for food (see the following figure). The mouse starts at room 1. From there, have the mouse go to either room 2 or room 4 (decide randomly). Pause to display this movement to the user. If the mouse goes to room 4, then for the next step it can move to room 1, room 2, or room 5 (decide randomly and then display the move). Make your simulation end when the mouse goes to room 3 (and finds the cheese) or goes to room 5, where the cat is patiently waiting for its snack. Open the file HungryMouse_Incomplete .sb from this chapter’s folder, and follow the instructions to complete the simulation. Using Decisions to Make Games 127
128 Chapter 9 3. Obi-Wan Kenobi needs to know the day of the week. But R2-D2 just beeps at him. Obi-Wan counts the beeps, but he needs your help to translate that number into the day of the week. Write an If/ElseIf ladder that compares the value of the variable dayNum with 1, 2, 3, . . . , 7 and sets the value of the variable dayName to "Sunday", "Monday", "Tuesday", . . . , "Saturday" (so 1 is Sunday and 7 is Saturday). Help Obi Wan Kenobi. You’re his only hope!
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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,
Page 101 and 102: Figure 6-2: The text window waiting
Page 103 and 104: 4 C = (5 / 9) * (F - 32) 5 C = Math
Page 105 and 106: 9 noun = TextWindow.Read() 10 11 Te
Page 108 and 109: 7 Empowering Programs with Math If
Page 110 and 111: Here’s a sample run of our progra
Page 112 and 113: Round() -4 -3.5 -3 0 3 3.5 4 Round(
Page 114 and 115: This code snippet shows you some ex
Page 116 and 117: Let’s walk through this program l
Page 118 and 119: Trigonometric Methods Trigonometric
Page 120: Programming Challenges If you get s
Page 123 and 124: Small Basic uses a few different wa
Page 125 and 126: You can test all sorts of condition
Page 127 and 128: Small Basic first finds the value o
Page 129 and 130: Your mom’s instructions assume th
Page 131 and 132: But wait, your mom just realized th
Page 133 and 134: This code asks the user to enter a
Page 136 and 137: 9 Using Decisions to Make Games Som
Page 138 and 139: Condition 1 True Statement set 1 If
Page 140 and 141: This change to the program means th
Page 142 and 143: Door 1 Door 2 Door 3 Figure 9-6: Pe
Page 144 and 145: Listing 9-4 shows an example of usi
Page 146 and 147: Think of the Shapes object as a “
Page 148 and 149: Background image (Grid.png) Star.pn
Page 150 and 151: In Figure 9-8, you see that the gri
Page 154 and 155: 10 Solving Problems with Subroutine
Page 156 and 157: Gulliver later learned that 1 glum-
Page 158 and 159: TRY IT OUT 10-1 When Gulliver asked
Page 160 and 161: variables that belong to the main p
Page 162 and 163: 4 TextWindow.WriteLine("Your turn.
Page 164 and 165: 1 step away). If the arrow hits the
Page 166 and 167: Then you set the graphics window’
Page 168 and 169: 24 Shapes.SetText(msgText, "") 25 T
Page 170 and 171: Step 8: Shoot Arrows with ShootArro
Page 172 and 173: Lines 3-7 animate the dragon’s fi
Page 174 and 175: 11 Event-Driven Programming So far,
Page 176 and 177: GraphicsWindow Events Let’s start
Page 178 and 179: 4 5 Sub OnKeyDown 6 GraphicsWindow.
Page 180 and 181: 13 Else 14 GraphicsWindow.DrawText(
Page 182 and 183: Useful Tips Before moving on, we’
Page 184 and 185: 21 GraphicsWindow.BrushColor = "Red
Page 186 and 187: 4 XG = Math.GetRandomNumber(8) - 1
Page 188: Programming Challenges If you get s
Page 191 and 192: Today, most programs use a graphica
Page 193 and 194: located at (100, 100). By default,
Page 195 and 196: 9 GraphicsWindow.MouseMove = OnMous
Page 197 and 198: Let’s look at the computations. Y
Page 199 and 200: You start by loading the two backgr
Page 201 and 202: (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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