calculator.md

Calculator Program

• Practice writing methods to perform algebraic tasks
• Practice calling and implementing methods from a different class

Prerequisites

• Hello World
• Basics

Instructions

1. Create a new project called Calculator and add a new Java Class inside the src folder. Name the file Main. Create your main method.

2. Create another Java class in your src folder. Name it Calculate.

3. Create four new methods within the Calculate file that will compute and return the sum, difference, product, and quotient of two numbers passed to them.

4. Add another method that will convert inches to feet. The method should take in one input and return a string stating the total amount of feet as well as the inches left over.

5. Back in the Main file, in your main method, initialize three variables, create an instance of the Calculate class, call each of the five methods using the instance you created, and print the outputs to the console.

Results

Try it yourself before looking at these!

Code

Main.java

        public class Main {
        
            public static void main(String[] args) {
                double x = 5.0;
                double y = 10.0;
                double inches = 30.0;
                Calculate calculate = new Calculate();
                System.out.println(calculate.add(x, y));
                System.out.println(calculate.subtract(x, y));
                System.out.println(calculate.multiply(x, y));
                System.out.println(calculate.divide(x, y));
                System.out.println(calculate.inchesToFeet(inches));
            }
        }

Calculate.java

        public class Calculate {
            public double add(Double x, Double y) {
                return x + y;
            }
        
            public double subtract(Double x, Double y) {
                return x - y;
            }
        
            public double multiply(Double x, Double y) {
                return x * y;
            }
        
            public double divide(Double x, Double y) {
                return x / y;
            }
        
            public String inchesToFeet(Double x) {
                int feet = (int) (x / 12);
                int inchesLeftOver = (int) (x % 12);
                return feet + " feet and " + inchesLeftOver + " inches";
            }
        }

Console Output

15.0
-5.0
50.0
0.5
2 feet and 6 inches

Process finished with exit code 0