REVIEW

a)

import java.util.Scanner;
public class IsPalindrome {
    public static void main(String [] args) {
        Scanner sc = new Scanner (System.in);
        System.out.print("Enter a String: ");
        String s = sc.next();

        String revS = "";
        for(int i = s.length()-1; i >= 0; i--) {
            revS += s.charAt(i);
        }

        System.out.println("String reversed: " + revS);

        if(s.equalsIgnoreCase(revS)) {
            System.out.println("This String is a palindrome.");
        } else {
            System.out.println("This String is nota palindrome.");
        }
    }
}


b) 

public static void main(String[] args) throws Exception {
    File file = new File("Week9Emails.txt");
    Scanner scanner = new Scanner(file);

    System.out.println("Unique Domain Names:");

    while (scanner.hasNext()) {
         String first = scanner.next();
         String last = scanner.next();
         String email = scanner.next();
         String domain = email.substring(email.indexOf('@') + 1);
         System.out.println(domain);
    }
    scanner.close();
}

c) first = (name1.compareTo(name2) < 0) ? name2 : name1;

d)

String word, prev;
boolean isdup=false;
n=0;
prev=stdin.next();
word=stdin.next();
while (!word.equals("xxxxx")) {
	if (word.equals(prev))
		isdup=true;
	else {
		if (!isdup) n++;
		isdup=false;
	}
	prev = word;
	word=stdin.next();
}
if (!isdup) n++;

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Week 10

1) 

public static void printMessage(String message) {
    System.out.println(message);
}

2)

public static void calculateArea(double length, double width) {
    double area = length * width;
    System.out.println("The area of the rectangle is: " + area);
}


3)

public static void calcAverage() {
    Scanner scanner = new Scanner(System.in);

    System.out.print("Input the first number: ");
    double num1 = scanner.nextDouble();

    System.out.print("Input the second number: ");
    double num2 = scanner.nextDouble();

    System.out.print("Input the third number: ");
    double num3 = scanner.nextDouble();

    double average = (num1 + num2 + num3) / 3;

    System.out.printf("The average value is %.1f\n", average);

    scanner.close();
}

4)

public static void printPattern(int n) {
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            System.out.print("*");
        }
        System.out.println();
    }
}

5)

import java.util.Scanner;
public class W11_Q1 {
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter the day of the week:");
        String day = scanner.next();

        System.out.println("Enter the date:");
        int date = scanner.nextInt();

        System.out.println("Enter the month (January to December):");
        String month = scanner.next();

        System.out.println("Enter the year:");
        int year = scanner.nextInt();

        printAmerican(day, date, month, year);
        printEuropean(day, date, month, year);

        scanner.close();
    }

    public static void printAmerican(String day, int date, String month, int year) {
        System.out.println(day + ", " + month + " " + date + ", " + year);
    }

    public static void printEuropean(String day, int date, String month, int year) {
        System.out.println(day + " " + date + " " + month + " " + year);
    }
}

6) 

// Method to find the largest of three integers
public static int biggest(int a, int b, int c) {
    int largest = a; // assume 'a' is the largest to start

    if (b > largest) {
        largest = b;
    }
    if (c > largest) {
        largest = c;
    }

    return largest; // return the largest value
}

OR 

public static int biggest(int a, int b, int c) {
    return Math.max(a, Math.max(b, c));
}

7)

// Method to calculate the perimeter of a triangle
public static double calcPerimeter(double a, double b, double c) {
    return a + b + c;
}

// Method to calculate the perimeter of a square
public static double calcPerimeter(double length) {
    return 4 * length;
}

// Method to calculate the perimeter of a rectangle
public static double calcPerimeter(double length, double width) {
    return 2 * (length + width);
}