Calculator.java

/**
 * A simple Java Console Calculator
 * Supports: Addition, Subtraction, Multiplication, Division
 */

import java.util.Scanner;
public class Calculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

       
        System.out.print("Enter first number: ");
        double num1 = sc.nextDouble();

        System.out.print("Enter second number: ");
        double num2 = sc.nextDouble();

        System.out.println("Choose operation: +  -  *  /");
        char option = sc.next().charAt(0);

        double result = 0;

        switch (option) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                if (num2 != 0) {
                    result = num1 / num2;
                } else {
                    System.out.println("Error: Division by zero is not allowed!");
                    return;
                }
                break;
            default:
                System.out.println("Invalid operation selected!");
                return;
        }

        System.out.println("Result: " + result);
    }
}