Conditionals - boolean operators

Conditionals -- Boolean operations

• not
• and
• or
• de Morgan's laws

BooleanExamples.java

Deitel 5.9

Classwork

Create a project and in it a class with a main.

We will be using the Scanner class to read from the user. At the top of your main class, after the package statement, paste

import java.util.Scanner;

Part A

         Scanner scan = new Scanner(System.in);
	System.out.println("What is x?");
        int x = scan.nextInt();
        System.out.println("What is y?");
        int y = scan.nextInt();
        System.out.println("What is z?");
        int z = scan.nextInt();
        System.out.println("What is w?");
        int w = scan.nextInt();
        
        boolean happy;
        boolean dead;
        
        System.out.println("Are you happy (y/n)?");
        String userhappy = scan.next();

        System.out.println("Are you dead (y/n)?");
        String userdead = scan.next();

☑ After this, if what they enter for userhappy is "y" set happy to true, otherwise to false.

Do the same again to set a value for dead, so that we can better serve our zombie users.

  ☑ Write single if statements using boolean operators to do as follows using the ints and booleans (not the strings):

• if x, y, and z all have the same value and the user is happy then print "Same and happy"
• if w is over 12 and the user is both happy and alive then print "Over 12, happy, alive"
• if x is less than z and both w and y are in the range between x and z print "in order"
• if either the user is happy and dead, or sad and alive then print "happy zombie or emo friend"

Part B

 ☑ Add a new (different from part A) class with a main.  In main,  ask the user for a value for each of  three int variables x, y, and z.

 ☑ Using conditionals with logical operators, print the three ints back out in decreasing order.  (If two numbers are the same, it doesn't matter which order)  (note this is different from the previous EC, when you did not have logical operators)

So whether you were given 2, 1, 3,  or 1,2,3 or 3,1,2, you'd print out 3, 2, 1.

You may add extra variables (i.e. small, med, and large) if you wish, but that is NOT the only way to solve this.

(hint: think about how many possible combinations there are.  There is NO WAY to make the code shorter than just testing for all the possible combinations.  I promise.  There is no trick to shortening this.  You must handle every possibility.)

Make sure you test all possible orders for the three numbers to check your code works.