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Exercises for Chapter 4.
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‎ch04/BegMethodSignature.java‎

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//Exercise 4-G.
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public class BegMethodSignature
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{
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public static void main(String[] args)
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{
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printSum(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
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printSum(5, 5, 5, 5, 5, 5, 5, 5, 5, 5);
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}
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private static void printSum(int a, int b, int c, int d, int e, int f, int g, int h, int i, int j)
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{
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int sum = a + b + c + d + e + f + g + h + i + j;
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System.out.println("The values of a through j are: " + a + ", " + b + ", " + c + ", " + d + ", " + e + ", " + f + ", " + g + ", " + h + ", " + i + ", " + j);
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System.out.println("This sum of a through j is: " + sum);
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System.out.println();
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}
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}

‎ch04/DemoMath.java‎

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//Exercise 4-E.
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public class DemoMath
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{
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public static void main(String[] args)
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{
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int a = -4;
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int b = 5;
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System.out.println("The value of a is: " + a);
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System.out.println("The absolute value of a is: " + Math.abs(a));
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System.out.println();
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System.out.println("The value of a is: " + a);
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System.out.println("The value of b is: " + b);
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System.out.println("The max value of a and b is: " + Math.max(a, b));
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System.out.println();
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double c = 6.0;
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System.out.println("The value of c is: " + c);
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System.out.println("The value of c to the power of c is: " + Math.pow(c, c));
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System.out.println();
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System.out.println("The valued of PI is: " + Math.PI);
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}
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}

‎ch04/Employee.java‎

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//Exercise 4-H.
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import java.util.Scanner;
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import java.util.Random;
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public class Employee
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{
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public static void main(String[] args)
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{
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int birthYear = 1995;
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boolean isUnionMember = false;
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String firstName = "Robin";
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String middleName = "Ann";
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String lastName = "Daniel";
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int employeeNumber;
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printHeader();
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Scanner in = new Scanner(System.in);
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System.out.println("Please enter your 5 digit employee number: ");
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employeeNumber = in.nextInt();
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printFullName(lastName, firstName, middleName);
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printUnionStatus(isUnionMember);
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printAge(birthYear);
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printEvenOrOdd(employeeNumber);
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printGenerateSecretPassword(employeeNumber);
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}
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private static void printHeader()
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{
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String header = "Welcome to the WallabyTech Employee Application\n";
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header += "-----------------------------------------------\n";
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System.out.print(header);
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}
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private static void printFullName(String ln, String fn, String mn)
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{
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System.out.println(ln + ", " + fn + " " + mn);
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}
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private static void printUnionStatus(boolean s)
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{
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System.out.println("Your union status is: " + s);
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}
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private static void printAge(int a)
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{
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final int CURRENT_YEAR = 2018;
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int age = CURRENT_YEAR - a;
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System.out.println("Your age is: " + age);
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}
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private static void printEvenOrOdd(int n)
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{
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int typeOfNumber = (n % 2);
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System.out.println("Employee Number is even (0) or odd (1): " + typeOfNumber);
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}
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private static void printGenerateSecretPassword(int n)
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{
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Random random = new Random();
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int number = random.nextInt(10) + 1;
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int password = ((n + number) * 5);
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// System.out.println(number); //Did this to check the computation.
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System.out.println("Employee's random secret ps is: " + password);
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}
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}

‎ch04/Exercise4_1.java‎

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//Exercise 4-1.
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public class Exercise4_1
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{
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public static void zoop()
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{
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baffle();
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System.out.print("You wugga ");
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baffle();
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}
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public static void main(String[] args)
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{
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System.out.print("No, I ");
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zoop();
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System.out.print("I ");
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baffle();
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}
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public static void baffle()
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{
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System.out.print("wug");
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ping();
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}
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public static void ping()
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{
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System.out.println(".");
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// baffle(); <= Causes an endless loop.
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}
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}
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//No, I wug. (new line)
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//You wugga wug. (new line)
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//I wug.
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//invoke baffle() at the end of ping()
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//No, I wug.
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//wug. Endless loop of "wug."

‎ch04/MathUtil.java‎

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//Exercise 4-F.
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public class MathUtil
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{
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public static void main(String[] args)
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{
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printDifference(-4, 5);
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printAbsValue(-45);
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printDifference(1000, 4000000);
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}
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private static void printDifference(int a, int b)
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{
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int difference = a - b;
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System.out.println("The values of a and b are: " + a + " and " + b);
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System.out.println("This difference between a and b is: " + difference);
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System.out.println();
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printAbsValue(difference);
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}
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private static void printAbsValue(int c)
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{
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int absoluteValue = Math.abs(c);
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System.out.println("The value of c is: " + c);
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System.out.println("The absolute value of c is: " + absoluteValue);
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System.out.println();
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}
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}

‎ch04/PrintDates.java‎

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//Exercise 4-3.
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public class PrintDates
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{
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public static void main(String[] args)
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{
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String day = "Wednesday";
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int date = 18;
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String month = "April";
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int year = 2018;
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printAmerican(day, date, month, year);
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System.out.println();
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printEuropean(day, date, month, year);
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}
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public static void printAmerican(String day, int date, String month, int year)
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{
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System.out.println("American format:");
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System.out.print(day);
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System.out.print(", ");
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System.out.print(month);
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System.out.print(" ");
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System.out.print(date);
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System.out.print(", ");
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System.out.println(year);
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}
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public static void printEuropean(String day, int date, String month, int year)
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{
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System.out.println("European format:");
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System.out.print(day);
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System.out.print(" ");
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System.out.print(date);
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System.out.print(" ");
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System.out.print(month);
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System.out.print(" ");
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System.out.println(year);
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}
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}

‎ch04/SimpleMethods.java‎

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// Exercise 4-A.
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public class SimpleMethods
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{
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public static void main(String[] args)
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{
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printCount(5);
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printSum(4, 6);
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printSum(7, 2);
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printBoolean(true);
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printBoolean(false);
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}
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private static void printCount(int count)
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{
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System.out.println("This count is: " + count);
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}
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private static void printSum(int x, int y)
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{
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int z = x + y;
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System.out.println(x + " + " + y + " = " + z);
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}
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private static void printBoolean(boolean isRich)
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{
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System.out.println("I am rich: " + isRich);
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}
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}
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