ISTE-120 Lab 03: Calculators Exercise 1: The Calculator Class The first part of this lab is to write a class that simulates a calculator. Our calculator will be pretty simple. It will do addition, subtraction, multiplication, and division Calculators work with a single storage cell, called the accumulator, that keeps track of the current value in the calculator. This accumulator will be (the only) attribute of this class. It will be private (of course) and its type will be double. A double value in Java is one which stores a number (as opposed, for instance, a String). Further, a double can store a number with a fractional component (i.e. with digits to the right of the decimal point) Our only constructor will be the default constructor (the one without any parameters inside the parentheses). It will initialize the accumulator to zero The methods will be An accessor (getAccumulator) A method to add a number to the accumulator A method to subtract a number from the accumulator A method to multiply the accumulator by a number A method to divide a number into the accumulator . . . A method to clear the calculator (i.e. set the accumulator to zero) A toString method that returns the accumulator as a String . The division method will refuse to divide 0 into the accumulator. If the user tries to do this, it will print the error message It will NOT change the accumulator in this case Consider this simple test class to understand how the calculator can be made to work. public class TestCalcl [ ATTEMPT TO DIVIDE BY ZERO - IGNORE public static void main (String[] args) Calculator myCalc = new Calculator(); double myWeight = 145; // instead of 145 use your weight in pounds myCalc.add (myWeight) myCalc.multiply (0.453952) System.out .print 1n("Hy weight is " + myWeight + "lb = " + /I convert weight to KG myCalc + "kg")