private void ex13(){
        myWindow.clearOut();

        boolean b1 = true;
        boolean b2 = false;
        boolean b3;             //new variable to put 1 value to be able to swap

        myWindow.writeOutLine("The value of b1 is: " + b1);
        myWindow.writeOutLine("The value fo b2 is: " + b2);

        //swap the values in 2 variables
        b3 = b1;
        b1 = b2;
        b2 = b3;

        myWindow.writeOutLine("The current state of b1 after reversal is: " + b1);
        myWindow.writeOutLine("The current state of b1 after reversal is: " + b2);



    }

    private void ex14(){
        myWindow.clearOut();

        //EQN = ax2 + bx + c = 0. Finding roots (x's) - declare variables
        double a = 2;
        double b = 7;
        double c = 1;


        double discriminant = Math.sqrt((Math.pow(b, 2))-(4*a*c));
        double numerator1 = -b + discriminant;                    //eq 1
        double numerator2 = -b - discriminant;                    //eq 2
        double denominator = 2*a;

        double root1 = numerator1/denominator;                    //eq to get x1
        double root2 = numerator2/denominator;                    //eq to get x2

        myWindow.writeOutLine("The root x1 is: " + root1);
        myWindow.writeOut("The root x2 is: " + root2);

    }

    private void ex22(){
        myWindow.clearOut();
        int n = 24;

        /* //TEST VALUES
        int n = 39;
        int n = 1822;
        int n = -12;
        int n = 0;
         */

        boolean remainder = ((n % 2) == 0);
        myWindow.writeOut("Is this number divisible by 2? " + n + ": " + remainder);

    }

    private void ex23(){
        myWindow.clearOut();
        int n = -83;

        /* //TEST VALUES
        int n = 39;
        int n = 1822;
        int n = -12;
        int n = 2;
        int n = -47;
        int n = 0;
         */

        boolean negNum = n < 0;
        boolean oddNum = (n % 2 == 1);            /
        boolean negAndOdd = negNum && oddNum;

        myWindow.writeOut("Is this number negative, and odd? " + n + ": " + negAndOdd);
    }

    private void ex24(){
        myWindow.clearOut();

        int n = 22;
        /* //TEST VALUES
        int n = 42;
        int n = 39;
        int n = 1822;
        int n = -12;
        int n = 2;
        int n = -47
        int n = 0;
         */

        boolean x1;
        boolean x2;
        boolean x3;
        boolean result;

        x1 = (n >= 1 && n <= 100);  //1 to 100 inclusive
        x2 = (n >= 40 && n <= 50);  //40 to 50 inclusive
        x3 = (n % 2 == 0);          //even numbers

        result = x1 && !(x2 && x3);
        myWindow.writeOutLine(result);
    }

    private void ex25(){
        myWindow.clearIn();
        myWindow.clearOut();

        String userInput;
        userInput = myWindow.readIn();

        boolean userResult = userInput.equalsIgnoreCase("y") || userInput.equalsIgnoreCase("n");
        myWindow.writeOut(userResult);

    }

    private void ex26(){
        myWindow.clearOut();


        String userInput;

        userInput = "1998done";             //returns true if a String variable “userInput” does not have the value “done”, false if has done
//        userInput = "done";               //prints false
//        userInput = "Done";               //prints true - capital D used
//        userInput = "Jasmine Kaur";       //prints true

        boolean userResult = !userInput.contains("done");

        myWindow.writeOut(userResult);

    }

    private void ex28(){
        myWindow.clearOut();

        //set of test values
        int year = 2016;
        //int year = 2017;
        //int year = 4929;
        //int year = 2028;

        boolean x1 = year % 4 == 0;
        boolean x2 = year % 100 != 0;
        boolean x3 = year % 400 == 0;
        boolean IsLeapYear;

        IsLeapYear = x1 && x2 || x3;
        myWindow.writeOutLine("Is " + year + " a leap year? " + IsLeapYear);