Java Program to Create a Calculator Using Switch Case

WAP to create a calculator using a switch case in Java

Logical Steps:

To create simple calculator using switch case, follow these steps:
1. Take User Input:
  - Ask the user to enter two numbers.
  - Ask the user to choose an arithmetic operation (+, -, *, /, or %).
2. Use a Switch Case for the Operation:
  - Use the switch statement to handle the selected operation.
  - Perform the appropriate arithmetic operation based on the user's choice.
3. Perform the Calculation:
  - Case-wise execution will calculate the result.
  - Handle the default case for invalid operations.
4. Display the Result:
  - Print the result of the selected arithmetic operation.

Programs:

Below is the simple program:

public class CalculatorSwitchCase
{
    public static void main(String[] args)
    {
        double no1=10, no2=30;

        char operator = '*';

        double result;

        // Use switch case to perform the selected operation
        switch (operator)
        {
            case '+':
                result = no1 + no2;
                System.out.println("Result: " + result);
                break;
            case '-':
                result = no1 - no2;
                System.out.println("Result: " + result);
                break;
            case '*':
                result = no1 * no2;
                System.out.println("Result: " + result);
                break;
            case '/':
                if (no2 != 0) {
                    result = no1 / no2;
                    System.out.println("Result: " + result);
                }
                else
                {
                    System.out.println("Error: Division by zero is not allowed.");
                }
                break;
            case '%':
                if (no2 != 0)
                {
                    result = no1 % no2;
                    System.out.println("Result: " + result);
                }
                else
                {
                    System.out.println("Error: Modulus by zero is not allowed.");
                }
                break;
            default:
                System.out.println("Invalid operator. Please choose a valid operation.");
        }
    }
}

Output:

Result: 300.0

Below is the program by taking user input:

import java.util.Scanner;

public class CalculatorSwitchCase
{
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);

        // Take two numbers as input
        System.out.print("Enter the first number: ");
        double no1 = scanner.nextDouble();

        System.out.print("Enter the second number: ");
        double no2 = scanner.nextDouble();

        // Ask the user to choose an operation
        System.out.println("Choose an operation (+, -, *, /, %): ");
        char operator = scanner.next().charAt(0);

        double result;

        // Use switch case to perform the selected operation
        switch (operator)
        {
            case '+':
                result = no1 + no2;
                System.out.println("Result: " + result);
                break;
            case '-':
                result = no1 - no2;
                System.out.println("Result: " + result);
                break;
            case '*':
                result = no1 * no2;
                System.out.println("Result: " + result);
                break;
            case '/':
                if (no2 != 0)
                {
                    result = no1 / no2;
                    System.out.println("Result: " + result);
                }
                else
                {
                    System.out.println("Error: Division by zero is not allowed.");
                }
                break;
            case '%':
                if (no2 != 0)
                {
                    result = no1 % no2;
                    System.out.println("Result: " + result);
                }
                else
                {
                    System.out.println("Error: Modulus by zero is not allowed.");
                }
                break;
            default:
                System.out.println("Invalid operator. Please choose a valid operation.");
        }

        // Close the scanner
        scanner.close();
    }
}

Output:

Enter the first number: 10
Enter the second number: 20
Choose an operation (+, -, *, /, %): 
+
Result: 30.0

Program Explanation:

Input and Variables:
- The program takes two numbers as input (no1 and no2).
- The user selects an arithmetic operation (+, -, *, /, %).
Switch Case for Operations:
- The switch statement checks the operator entered by the user and performs the corresponding operation.
- Addition (+): Adds no1 and no2.
- Subtraction (-): Subtracts no1 from no2.
- Multiplication (*): Multiplies no1 and no2.
- Division (/): Divides no1 by no2. If no2 is zero, it displays an error message.
- Modulus (%): Computes the remainder when no1 is divided by no2.
Default Case:
- If the user enters an invalid operator, the default case displays an error message.
Display the Result:
- The program prints the result of the selected arithmetic operation.
Close Scanner:
- The scanner.close() method is used to close the input stream and release resources.

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WAP to create a calculator using a switch case in Java

Logical Steps:

Programs:

Output:

Output:

Program Explanation:

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