Writing Methods that Return a Value in JavaIn this lab, you complete a partially written Java program that includes a method that returns a value. The program is a simple calculator that prompts the user for two numbers and an operator ( +, −, *, /,or% ). The two numbers and the operator are passed to the method where the appropriate arithmetic operation is performed. The result is then returned to the main() method where the arithmetic operation and result are displayed. For example, if the user enters 3, 4, and *, the following is displayed:3.00 * 4.00 = 12.00The source code file provided for this lab includes the necessary variable declarations, and input and output statements. Comments are included in the file to help you write the remainder of the program.InstructionsWrite the Java statements as indicated by the comments.Execute the programTasksDefined performOperation()Input / output testsMultiplication input / output testDivision input / output testSubtraction input / output testAddition input / output testperformOperation unit testsperformOperation addition testperformOperation multiplication testUse The Given Code// Calculator.java - This program performs arithmetic, ( +. -, *. /, % ) on two numbers// Input: Interactive.// Output: Result of arithmetic operationimport java.util.Scanner;public class Calculator{ public static void main(String args[]) { double numberOne, numberTwo; String numberOneString, numberTwoString; String operation; double result; Scanner input = new Scanner(System.in); System.out.println("Enter the first number: "); numberOneString = input.nextLine(); numberOne = Double.parseDouble(numberOneString); System.out.println("Enter the second number: "); numberTwoString = input.nextLine(); numberTwo = Double.parseDouble(numberTwoString); System.out.println("Enter an operator (+.-.*,/,%): "); operation = input.nextLine(); // Call performOperation method here System.out.format("%.2f",numberOne); System.out.print(" " + operation + " "); System.out.format("%.2f", numberTwo); System.out.print(" = "); System.out.format("%.2f", result); System.exit(0); } // End of main() method. // Write performOperation method here. } // End of Calculator class.

We can use switch case for building the calculator class

Answered: Writing Methods that Return a Value in…

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter10: Classes And Data Abstraction

Section: Chapter Questions

Problem 15PE

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Writing Methods that Return a Value in Java

In this lab, you complete a partially written Java program that includes a method that returns a value. The program is a simple calculator that prompts the user for two numbers and an operator ( +, −, *, /,or% ). The two numbers and the operator are passed to the method where the appropriate arithmetic operation is performed. The result is then returned to the main() method where the arithmetic operation and result are displayed. For example, if the user enters 3, 4, and *, the following is displayed:

3.00 * 4.00 = 12.00

The source code file provided for this lab includes the necessary variable declarations, and input and output statements. Comments are included in the file to help you write the remainder of the program.

Instructions

Write the Java statements as indicated by the comments.
Execute the program

Tasks

Defined performOperation()
Input / output tests
1. Multiplication input / output test
2. Division input / output test
3. Subtraction input / output test
4. Addition input / output test
performOperation unit tests
1. performOperation addition test
2. performOperation multiplication test

Use The Given Code

// Calculator.java - This program performs arithmetic, ( +. -, *. /, % ) on two numbers

// Input: Interactive.

// Output: Result of arithmetic operation

import java.util.Scanner;

public class Calculator

{

public static void main(String args[])

{

double numberOne, numberTwo;

String numberOneString, numberTwoString;

String operation;

double result;

Scanner input = new Scanner(System.in);

System.out.println("Enter the first number: ");

numberOneString = input.nextLine();

numberOne = Double.parseDouble(numberOneString);

System.out.println("Enter the second number: ");

numberTwoString = input.nextLine();

numberTwo = Double.parseDouble(numberTwoString);

System.out.println("Enter an operator (+.-.*,/,%): ");

operation = input.nextLine();

// Call performOperation method here

System.out.format("%.2f",numberOne);

System.out.print(" " + operation + " ");

System.out.format("%.2f", numberTwo);

System.out.print(" = ");

System.out.format("%.2f", result);

System.exit(0);

} // End of main() method.

// Write performOperation method here.

} // End of Calculator class.

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