Merge pull request #62 from HarryDulaney/hg-new-solutions

Add Ch 16_05 + Ch 16_10 + updated Ch 03_24 to use if else select stat…

ch_02/Exercise02_09.java

@@ -17,18 +17,13 @@
  */
 public class Exercise02_09 {
     public static void main(String[] args) {
-
         double v0, v1, t;
-
         Scanner input = new Scanner(System.in);
         out.println("Enter v0, v1, and t: ");
-
         v0 = input.nextDouble();
         v1 = input.nextDouble();
         t = input.nextDouble();
-
         double a = (v1 - v0) / t;
-
         out.printf("The average acceleration is %2.4f", a);
     }
 }

ch_02/Exercise02_12.java

@@ -14,12 +14,9 @@
 public class Exercise02_12 {
     public static void main(String[] args) {
         java.util.Scanner input = new java.util.Scanner(System.in);
-
         System.out.print("Enter speed (meters/second) and acceleration (meters/second squared): ");
         double speed = input.nextDouble();
         double accel = input.nextDouble();
-
-
         System.out.printf("The length of runway need is: %2.3f", Math.pow(speed, 2) / (2 * accel));
     }
 }

ch_02/Exercise02_13.java

@@ -12,24 +12,18 @@
  * loop to simplify the code and display the account value for any month.)
  */
 public class Exercise02_13 {
-
     public static void main(String[] args) {
-
         Scanner input = new Scanner(System.in);
         System.out.print("Enter  monthly contribution: ");
         double monthDeposit = input.nextDouble();
         double interestPerMonth = 0.05 / 12;
         double interestFactor = 1 + interestPerMonth;
-
         int count = 6;
         double total = 0;
 
         while (count != 0) {
-
             total = (total + monthDeposit) * interestFactor;
-
             --count;
-
         }
 
         System.out.print("At a 5% interest rate, you will have $");

ch_02/Exercise02_14.java

@@ -12,22 +12,15 @@
  */
 public class Exercise02_14 {
     public static void main(String[] args) {
-
         Scanner input = new Scanner(System.in);
-
         System.out.print("Please enter your weight in pounds: ");
         double weightInpounds = input.nextDouble();
-
-
         System.out.print("Please enter you height in inches: ");
-        double heightInInches = input.nextDouble();
 
+        double heightInInches = input.nextDouble();
         double weightInkilograms = weightInpounds * 0.45359237;
-
         double heightInmeters = heightInInches * 0.0254;
-
         double metersFactor = Math.pow(heightInmeters, 2);
-
         System.out.println("Your BMI is: " + weightInkilograms / metersFactor);
         input.close();
     }

ch_02/Exercise02_15.java

@@ -18,23 +18,14 @@ public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("Enter x1 and y1: ");
         double x1, x2, y1, y2;
-
         x1 = input.nextDouble();
         y1 = input.nextDouble();
-
         System.out.println("Enter x2 and y2: ");
-
         x2 = input.nextDouble();
         y2 = input.nextDouble();
-
         double exs = Math.pow((x2 - x1), 2);
         double whys = Math.pow((y2 - y1), 2);
-
         double a = Math.pow((exs + whys), 0.5);
-
         System.out.println("The distance between the two points is " + a);
-
-
     }
-
 }

ch_02/Exercise02_16.java

@@ -9,10 +9,8 @@
 public class Exercise02_16 {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
-
         System.out.println("Enter a decimal for the length of the side of a hexagon: ");
         double side = input.nextDouble();
-
         double operand = (3 * Math.pow(3, 0.5)) / 2;
         double res = operand * Math.pow(side, 2);
         System.out.println("The area of the hexagon is " + res);

ch_02/Exercise02_17.java

@@ -21,19 +21,12 @@
 public class Exercise02_17 {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
-
         System.out.println("Enter the temperature in Fahrenheit between -58°F and 41°F: ");
         double temp = input.nextDouble();
-
         System.out.println("Enter the wind speed (>=2) in miles per hour: ");
         int windSpeed = input.nextInt();
-
         double vToPow16 = Math.pow(windSpeed, 0.16);
-
         double twc = 35.74 + 0.6215 * temp - 35.75 * vToPow16 + 0.4275 * temp * vToPow16;
         System.out.println("The wind chill index is " + twc);
-
     }
-
-
 }

ch_02/Exercise02_20.java

@@ -17,14 +17,11 @@ public class Exercise02_20 {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("Enter balance and interest rate: (e.g., 3 for 3%): ");
-
         double balance = input.nextDouble();
         double rate = input.nextDouble();
         double interest = balance * (rate / 1200);
         double roundedInterest = Math.round(interest * 100000) / 100000.0;
         System.out.println("The interest rate is: " + roundedInterest);
         input.close();
-
-
     }
 }

ch_02/Exercise02_21.java

@@ -17,25 +17,16 @@
  * 4.25 Enter number of years: 1 Accumulated value is $1043.92
  */
 public class Exercise02_21 {
-
     public static void main(String[] args) {
-
         Scanner in = new Scanner(System.in);
-
         System.out.print("Enter investment amount: ");
         double investmentAmount = in.nextDouble();
-
         System.out.print("Enter annual interest rate in percentage: ");
         double monthInterestRate = in.nextDouble();
-
         System.out.print("Enter number of years: ");
         double years = in.nextInt();
-
-//		futureInvestmentValue = investmentAmount * (1 + monthlyInterestRate)^(numberOfYears*12)
-
         years *= 12;
         monthInterestRate /= 1200; //Convert from yearly to monthly and from percent to decimal
-
         System.out.printf("Accumulated Value is $%.2f",
                 investmentAmount * Math.pow(monthInterestRate + 1, years));
         in.close();

ch_03/Exercise03_11.java

@@ -11,7 +11,6 @@
  *
  */
 public class Exercise03_11 {
-
     public static void main(String[] args) {
         Scanner in = new Scanner(System.in);
 

ch_03/Exercise03_13.java

@@ -10,9 +10,7 @@
  *
  */
 public class Exercise03_13 {
-
 	public static void main(String[] args) {
-
 		Scanner input = new Scanner(System.in);
 		System.out.print("(0-single filer, 1-married jointly or "
 				+ "qualifying widow(er), 2-married separately, 3-head of " + "household) Enter the filing status: ");

ch_03/Exercise03_24.java

@@ -13,18 +13,48 @@
  * The card you picked is Jack of Hearts
  */
 public class Exercise03_24 {
+
+    private static String card = "";
+    private static String suit = "";
+
     public static void main(String[] args) {
+        int randomCardNumber = new Random().nextInt(53);
+        // 0 is not a valid card number
+        if(randomCardNumber == 0) {
+            randomCardNumber = 1;
+        }
+        System.out.println("Random card whole number is: " + randomCardNumber);
+        setCardFromRandomNumber(randomCardNumber);
+        System.out.println("The card you picked is " + card + " of " + suit);
 
-        String card = "";
-        String suit = "";
-        String[] cards = new String[]{"Ace", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King"};
-        String[] suits = new String[]{"Clubs", "Diamonds", "Hearts", "Spades"};
+    }
 
-        int randomCard, randomSuit;
-        randomCard = new Random().nextInt(13);
-        randomSuit = new Random().nextInt(5);
+    static void setCardFromRandomNumber(int randomCardNumber) {
+        if (randomCardNumber <= 13) {
+            suit = "Clubs";
+        } else if (randomCardNumber <= 26) {
+            suit = "Diamonds";
+        } else if (randomCardNumber <= 39) {
+            suit = "Hearts";
+        } else {
+            suit = "Spades";
+        }
 
-        System.out.println("The card you picked is " + cards[randomCard] + " of " + suits[randomSuit]);
+        card = getCardValue(randomCardNumber);
+    }
 
+    static String getCardValue(int randomCardNumber) {
+        int cardValue = randomCardNumber % 13; // Remove the suit from the card number
+        if (cardValue == 1) {
+            return "Ace";
+        } else if (cardValue == 11) {
+            return "Jack";
+        } else if (cardValue == 12) {
+            return "Queen";
+        } else if (cardValue == 0) { // 13 % 13 = 0
+            return "King";
+        } else {
+            return String.valueOf(cardValue);
+        }
     }
 }

ch_16/Exercise16_05.java

@@ -0,0 +1,90 @@
+package ch_16;
+
+
+import javafx.application.Application;
+import javafx.geometry.Pos;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.scene.input.KeyCode;
+import javafx.scene.layout.GridPane;
+import javafx.stage.Stage;
+
+/**
+ * 16.5 (Convert numbers) Write a program that converts between decimal, hex, and binary
+ * numbers, as shown in Figure 16.37c.
+ * When you enter a decimal value in the decimal value
+ * text field and press the Enter key, its corresponding hex and binary numbers are
+ * displayed in the other two text fields. Likewise, you can enter values in the other fields
+ * and convert them accordingly.
+ * <p>
+ * (Hint: Use the Integer.parseInt(s, radix)
+ * method to parse a string to a decimal and use Integer.toHexString(decimal)
+ * and Integer.toBinaryString(decimal) to obtain a hex number or a binary
+ * number from a decimal.)
+ */
+public class Exercise16_05 extends Application {
+
+    @Override
+    public void start(Stage primaryStage) {
+        TextField decimalTextField = new TextField();
+        decimalTextField.textProperty().addListener((observable, oldValue, newValue) -> {
+            /* If decimal input field contains non-numeric characters */
+            if (!newValue.matches("\\d*")) {
+                /* Remove any non-numeric characters */
+                decimalTextField.setText(newValue.replaceAll("[^\\d]", ""));
+            }
+        });
+
+        TextField hexTextField = new TextField();
+        TextField binaryTextField = new TextField();
+        decimalTextField.setAlignment(Pos.BOTTOM_RIGHT);
+        hexTextField.setAlignment(Pos.BOTTOM_RIGHT);
+        binaryTextField.setAlignment(Pos.BOTTOM_RIGHT);
+        GridPane pane = new GridPane();
+        pane.setAlignment(Pos.CENTER);
+        pane.setHgap(10);
+        pane.setVgap(2);
+        pane.add(new Label("Decimal"), 0, 0);
+        pane.add(decimalTextField, 1, 0);
+        pane.add(new Label("Hex"), 0, 1);
+        pane.add(hexTextField, 1, 1);
+        pane.add(new Label("Binary"), 0, 2);
+        pane.add(binaryTextField, 1, 2);
+
+        decimalTextField.setOnKeyPressed(e -> {
+            if (e.getCode() == KeyCode.ENTER) {
+                hexTextField.setText(Integer.toHexString(
+                        Integer.parseInt(decimalTextField.getText())));
+
+                binaryTextField.setText(Integer.toBinaryString(
+                        Integer.parseInt(decimalTextField.getText())));
+            }
+        });
+
+        hexTextField.setOnKeyPressed(e -> {
+            if (e.getCode() == KeyCode.ENTER) {
+                decimalTextField.setText(String.valueOf(
+                        Integer.parseInt(hexTextField.getText(), 16)));
+
+                binaryTextField.setText(Integer.toBinaryString(
+                        Integer.parseInt(hexTextField.getText(), 16)));
+            }
+        });
+
+        binaryTextField.setOnKeyPressed(e -> {
+            if (e.getCode() == KeyCode.ENTER) {
+                decimalTextField.setText(String.valueOf(
+                        Integer.parseInt(binaryTextField.getText(), 2)));
+
+                hexTextField.setText(Integer.toHexString(
+                        Integer.parseInt(binaryTextField.getText(), 2)));
+            }
+        });
+
+        Scene scene = new Scene(pane, 280, 160);
+        primaryStage.setTitle(getClass().getName());
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+}

ch_16/Exercise16_08.java

@@ -30,7 +30,6 @@ public class Exercise16_08 extends Application {
     private Circle circle2;
     private Rectangle rectangle;
     private Pane circlePane;
-
     private TextField c1XTextfield;
     private TextField c1YTextfield;
     private TextField c1RTextfield;