Part 2:

Create a Calculator class in the com.day1.practice3 package. This is how you would write the add method (create the remaining three methods on your own). public static double add(double num1, double num2) return num1 + num2; ( Note that the method has the key word "static". This means that we can all this method without havin to create a calculator class! In other words, we don't have to put in the main method: Calculator calculator = new Calculator(); double result = calculator. add ( num 1 , num 2)); We can simply call the method as follows: double result = Calculator. add ( num 1 , num2)); CalculatorDemo class Create a CalculatorDemo class in the com.day1.practice3 package. Put the following code in the main method: public static void main(String[] args) \{ Scannerscanner=newScanner(System.in); System.out.println("Enter a number:"); double num1 = scanner.nextDouble(); System.out.println("Enter another number:"); double num2 = scanner.nextDouble(); System.out.println(num1 +"+"+ num2 + "=+ Calculator.add(num1, num2)); scanner.close(); Update the main method to call the remaining three methods in the calculator class. Sample output: > CalculatorDemo [Java A Enter a number: 10 Enter another number: 5 10.0+5.0=15.0 10.05.0=5.0 10.05.0=50.0 10.0/5.0=2.0 Update the Calculator class. Overload the add and multiply methods to allow three doubles to be passed in. public static double add(double num1, double num2, double num3) public static double multiply(double num1, double num2, double num3) Then add the following methods: average - this method takes in three doubles and returns the average. Example: passing in 7, 11, and 21 would return 13. power - this method takes in a double and an int. It returns the double multiplied x times, where x is the integer passed in (For example: calling power (2.5,7) is 2.57=610.3515625 ). This will require doing a loop of some sort (if you are unfamiliar with loops, we will cover them on day two). See the class outline on the next page for the method signatures. Update the CalculatorDemo to test these new methods