# Unit 2: Using Objects

/* Lesson 1 Coding Activity Question 1 */

import java.util.Scanner;

public class U2_L1_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("What is your name?");
    String name = scan.nextLine();
    System.out.println("What is your favorite number?");
    int number = scan.nextInt();

    // Final Output
    System.out.println("Your name is " + name + " and you like the number " + number + ".");
  }
}

/* Lesson 1 Coding Activity Question 2 */

import java.util.Scanner;

public class U2_L1_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // Initial Order
    String itemName = "apple pie";
    System.out.println("The current order is " + itemName);
    // Change Order
    System.out.println("I want to eat something else, what do you want to eat?");
    itemName = scan.nextLine();

    // Final Output
    System.out.println("The order has changed to " + itemName);
  }
}

/* Lesson 2 Coding Activity Question 1 */

import java.util.Scanner;

public class U2_L2_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    /// Type of Item
    System.out.println("What type of item are you buying?");
    String itemType = scan.nextLine();
    /// Number of Item(s)
    System.out.println("How many are you buying?");
    int itemQuantity = scan.nextInt();
    /// Unit Weight of Item
    System.out.println("How much does each one weigh?");
    double unitWeight = scan.nextDouble();

    // Final Output
    System.out.println(itemQuantity + " " + itemType + " at " + unitWeight + " pounds each will weigh " + (unitWeight * itemQuantity) + " pounds total");
  }
}

/* Lesson 2 Coding Activity Question 2 */

public class U2_L2_Activity_Two
{
  public static void main(String[] args)
  {
    // Final Output
    System.out.println("\"That brain of mine is something more than merely mortal; as time will show.\"\nAda Lovelace\nThe first computer programmer");
  }
}

/* Lesson 2 Coding Activity Question 3 */

import java.util.Scanner;

public class U2_L2_Activity_Three
{
  public static void main(String[] args)
  {
    // Final Output
    System.out.print("(\\(\\\n( - -)\n((\') (\')");
  }
}

/* Lesson 3 Coding Activity Question 1 */

import java.util.Scanner;

public class U2_L3_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter a string:");
    String initStr = scan.nextLine();
    System.out.println("Enter a number:");
    int x = scan.nextInt();

    // Final Output
    String finalStr = initStr.substring(0, x) + initStr.substring(initStr.length() - x);
    System.out.println(finalStr);
  }
}

/* Lesson 3 Coding Activity Question 2 */

import java.util.Scanner;

public class U2_L3_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter a string:");
    String initStr = scan.nextLine();
    System.out.println("How many characters would you like to delete at the end?");
    int delChar = scan.nextInt();

    // Final Output
    String finalStr = initStr.substring(0, initStr.length() - delChar);
    System.out.println(finalStr);
  }
}

/* Lesson 3 Coding Activity Question 3 */

import java.util.Scanner;

public class U2_L3_Activity_Three
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    /// First Word
    System.out.println("Enter first word:");
    String w1 = scan.nextLine().toLowerCase();
    /// Second Word
    System.out.println("Enter second word:");
    String w2 = scan.nextLine().toLowerCase();

    // Comparing First Letters (ignores dash)
    int wordResult = w1.compareTo(w2);

    // Final Output
    System.out.println("Result: " + wordResult);
  }
}

/* Lesson 3 Coding Activity Question 4 */

import java.util.Scanner;

public class U2_L3_Activity_Four
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter a sentence:");
    String sentence = scan.nextLine();

    // Final Output
    System.out.println(sentence.indexOf(" "));
  }
}

/* Lesson 4 Coding Activity Question 1 */

import java.util.Scanner;

public class U2_L4_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    /// Get First String
    System.out.println("Enter first string");
    String s1 = scan.nextLine();
    /// Get Second String
    System.out.println("Enter second string");
    String s2 = scan.nextLine();
    /// Get # of Letters for Each String
    System.out.println("Enter number of letters from each word");
    int n = scan.nextInt();

    // Final Output
    /// Print Last n Letters of s1 + First n Letters of s2
    System.out.println(s1.substring(s1.length() - n, s1.length()) + s2.substring(0, n));
  }
}

/* Lesson 4 Coding Activity Question 2 */

import java.util.Scanner;

public class U2_L4_Activity_Two{
  public static void main(String[] args){

    // User Input
    Scanner scan = new Scanner(System.in);
    String str1 = scan.nextLine();
    String str2 = str1;

    // Final Output
    str1 = str1.toUpperCase();
    str2 = (str2.substring(0, 1).toUpperCase()) + str2.substring(1, str2.length());
    System.out.println(str2);
    System.out.println(str1);
  }
}

/* Lesson 5 Coding Activity Question 1 */

import shapes.*;

public class U2_L5_Activity_One
{
  public static void main(String[] args)
  {
    // Final Output
    Circle shape1 = new Circle(10.1);
    System.out.println(shape1);
    Circle shape2 = new Circle(14.0);
    System.out.println(shape2);
    Circle shape3 = new Circle(20.5);
    System.out.println(shape3);
  }
}

/* Lesson 5 Coding Activity Question 2 */

import java.util.Scanner;
import shapes.*;

public class U2_L5_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // Final Output
    /// Parameters for Rectangle 1
    System.out.println("Type a number for length and width:");
    double s1length = scan.nextDouble();
    Rectangle s1 = new Rectangle(s1length);
    /// Parameters for Rectangle 2
    System.out.println("Type a length:");
    double s2length = scan.nextDouble();
    System.out.println("Type a width:");
    double s2width= scan.nextDouble();
    Rectangle s2 = new Rectangle(s2length, s2width);

    // Final Output
    System.out.println(s1);
    System.out.println(s2);
  }
}

/* Lesson 5 Coding Activity Question 3 */

import java.util.Scanner;
import shapes.*;

public class U2_L5_Activity_Three
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Type a side length:");
    double sLength = scan.nextDouble();

    // Creating Shapes
    RegularPolygon s1 = new RegularPolygon(sLength);
    RegularPolygon s2 = new RegularPolygon(4, sLength);

    // Final Output
    System.out.println(s1);
    System.out.println(s2);
  }
}

/* Lesson 6 Coding Activity Question 1 */

import java.util.Scanner;
import shapes.*;

public class U2_L6_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter the radius of the circle:");
    System.out.print("> ");
    double r = scan.nextDouble();
    Circle s = new Circle(r);

    // Final Output
    System.out.println("A circle with a radius " + s.getRadius() + " has a circumference of " + s.getCircumference() + " and an area of " + s.getArea());
  }
}

/* Lesson 6 Coding Activity Question 2 */

import java.util.Scanner;
import shapes.*;

public class U2_L6_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    /// Number of Sides
    System.out.println("Enter number of sides: ");
    System.out.print("> ");
    int sNum = scan.nextInt();
    /// Side Length
    System.out.println("Enter the side length: ");
    System.out.print("> ");
    double sLength = scan.nextDouble();

    // Calculation
    RegularPolygon polygon = new RegularPolygon(sNum, sLength);

    // Final Output
    /// Area with Default sNum
    System.out.println("Area with " + polygon.getNumSides() + " sides: " + polygon.getArea());
    /// Area with sNum + 2
    System.out.println("Incrementing the number of sides by two");
    polygon.addSides(2);
    System.out.println("Area with " + polygon.getNumSides() + " sides: " + polygon.getArea());
  }
}

/* Lesson 7 Coding Activity Question 1 */

public class U2_L7_Activity_One
{
  public static void main(String[] args)
  {
    // Final Output
    int a = Integer.MAX_VALUE;
    a++;
    System.out.println(a);
    int b = Integer.MIN_VALUE;
    b--;
    System.out.println(b);
  }
}

/* Lesson 7 Coding Activity Question 2 */

import java.util.Scanner;

public class U2_L7_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // Prepare Variables
    Integer x = null;
    Integer y = null;

    // User Input
    System.out.println(x + " " + y);
    System.out.println("Enter values:");
    x = scan.nextInt();
    y = scan.nextInt();

    // Final Output
    Double avg = (((double)(x + y)) / 2);
    System.out.println("Average of " + x + " and " + y + " is " + avg);
  }
}

/* Lesson 7 Coding Activity Question 3 */

import java.util.Scanner;
import shapes.*;

public class U2_L7_Activity_Three
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter number of sides:");
    Integer sides = scan.nextInt();
    System.out.println("Enter side length:");
    Double length = scan.nextDouble();

    // Create Shapes
    RegularPolygon p1 = new RegularPolygon(sides, length);
    RegularPolygon p2 = new RegularPolygon(sides + 1, length * 2);

    // Final Output
    System.out.println("The area of a " + p1 + " is: " + p1.getArea());
    System.out.println("The area of a " + p2 + " is: " + p2.getArea());
  }
}

/* Lesson 8 Coding Activity Question 1 */

import java.util.Scanner;
import testing.Math;

public class U2_L8_Activity_One
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter a positive integer:");
    int n = scan.nextInt();

    // Calculation
    System.out.println((int) Math.round((Math.random() * n) + 2));
    System.out.println((int) Math.round((Math.random() * n) + 2));
    System.out.println((int) Math.round((Math.random() * n) + 2));
  }
}

/* Lesson 8 Coding Activity Question 2 */

import java.util.Scanner;

public class U2_L8_Activity_Two
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    /// Coordinates for x
    System.out.println("Enter the first x-coordinate:");
    double x1 = scan.nextDouble();
    System.out.println("Enter the second x-coordinate:");
    double x2 = scan.nextDouble();
    /// Coordinates for y
    System.out.println("Enter the first y-coordinate:");
    double y1 = scan.nextDouble();
    System.out.println("Enter the second y-coordinate:");
    double y2 = scan.nextDouble();

    // Slope Calculation
    double m = (y2 - y1) / (x2 - x1);

    // Final Output
    System.out.println("Slope: " + m);
  }
}

/* Lesson 8 Coding Activity Question 3 */

import java.util.Scanner;

public class U2_L8_Activity_Three
{
  public static void main(String[] args)
  {
    // Initialize Scanner
    Scanner scan = new Scanner(System.in);

    // User Input
    System.out.println("Enter two doubles:");
    System.out.print(">");
    Double num1 = scan.nextDouble();
    System.out.print(">");
    Double num2 = scan.nextDouble();

    // Difference Calculation
    int diff = (int) Math.abs(Math.round(num2 - num1));

    // Final Output
    System.out.println("Difference: " + diff);
  }
}