Java Code For Calculator With Switch Statement

Welcome to this blog on how to create a calculator in Java using text instructions! In this blog, we'll go through the steps of creating a simple calculator program that can perform basic arithmetic operations.
Before we start, let's discuss what a calculator program is and what it does. A calculator program is a software application that performs mathematical calculations. It typically has a graphical user interface (GUI) that allows users to enter numbers and perform various arithmetic operations, such as addition, subtraction, multiplication, and division.
In this tutorial, however, we will be creating a simple calculator program using only text instructions. This means that we will not be using a GUI or any visual elements to create our calculator. Instead, we will use the Java programming language to write code that performs the necessary calculations.
Here are the steps to create a calculator in Java using text instructions:
Step 1: Define the Problem
Before we start writing any code, we need to define the problem that our calculator program will solve. In this case, our program will need to perform basic arithmetic operations, such as addition, subtraction, multiplication, and division. We will also need to handle any errors that may occur, such as divide-by-zero errors.
Step 2: Plan the Solution
Next, we need to plan how we will solve the problem. We will use a simple approach that involves reading input from the user, performing the necessary calculations, and then displaying the results.
Here is an overview of the steps our program will take:
Prompt the user to enter the first number.
Read the first number from the user.
Prompt the user to enter the second number.
Read the second number from the user.
Prompt the user to select an arithmetic operation (addition, subtraction, multiplication, or division).
Read the selected operation from the user.
Perform the selected arithmetic operation on the two numbers.
Display the result to the user.
Handle any errors that may occur.
Step 3: Write the Code
Now that we have a plan, we can start writing the code for our calculator program. Here is the code we will use:
 package com.company;

import java.util.Scanner;

public class Java_Course_Switch_Ch4 {
    public static void main(String[] args) {
        Scanner scan1=new Scanner(System.in);
        System.out.println("Please enter First Number");
        int a=scan1.nextInt();
        System.out.println("Please enter Second Number");
        int b=scan1.nextInt();
        Scanner scan = new Scanner(System.in);
        System.out.println("Please enter 1 for add,2 for subtraction,3 for Multiplication,4 for division,5 for Reminder");
        int n = scan.nextInt();
        switch (n) {
            case 1:
                System.out.println("Your Number Addition is" + (a + b));
                break;

            case 2:
                System.out.println("Your Number Subtraction is" + (a - b));
                break;

            case 3:
                System.out.println("Your Number Multiplication  is" + (a * b));
                break;
            case 4:
                System.out.println("Your Number Division is" + (a / b));
                break;
            case 5:
                System.out.println("Your Number Reminder is" + (a % b));
                break;
            default:
                System.out.println("Does not match with any case");
        }
    }
}


OUTPUT:
Please enter First Number
3
Please enter Second Number
2
Please enter 1 for add,2 for subtraction,3 for Multiplication,4 for division,5 for Reminder
2
Your Number Subtraction is1
This code uses the Scanner class to read input from the user. We first prompt the user to enter the first and second numbers, and then read them using scanner.nextDouble(). Next, we prompt the user to select an arithmetic operation (+, -, *, /) and read the selected operation using scanner.next().charAt(0).
We then use a switch statement to perform the selected arithmetic operation on the two numbers. If the selected operation is division and the second number is 0, we handle the divide-by-zero error by displaying an error message and returning from the program using the return statement.
Finally, we display the result of the arithmetic operation using System.out.println("Result: " + result);.
Step 4: Test the Program
Once we have written the code, we need to test it to make sure it works correctly. We can do this by running the program and entering various numbers and arithmetic operations.
Here is an example of how we can test the program:
Enter the first number: 10
Enter the second number: 5
Enter the arithmetic operation (+, -, *, /): *
Result: 50.0
In this example, we entered the numbers 10 and 5, and selected the multiplication operation (*). The program correctly calculated the result to be 50.
Conclusion
In this blog, we have gone through the steps of creating a simple calculator program in Java using only text instructions. We started by defining the problem and planning the solution, and then wrote the code to implement the solution. We also tested the program to make sure it works correctly.
While this calculator program is very basic, it provides a good starting point for anyone who wants to learn how to create more complex calculator programs in Java or other programming languages. With a bit more practice and experience, you can build more sophisticated calculator programs that can handle more complex calculations and provide more advanced features.