cal.java

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {

        float number_1, number_2;
        System.out.println("Enter first number");

        Scanner scan = new Scanner(System.in);
        number_1 = scan.nextFloat();

        System.out.println("Enter second number");
        number_2 = scan.nextFloat();
        System.out.print("You have Entered ");
        System.out.print(number_1);
        System.out.print(" and ");
        System.out.println(number_2);
        System.out.println("What operation you want to do:- +,-,*,/");
        
        
        String prompt = "(Enter 0 for addition, 1 for " +
                        "subtraction, 2 for multiplication and 3 for division)";
        System.out.println(prompt);
        int input = scan.nextInt();
        switch (input){
            case 0:
                System.out.println("Adding these numbers");
                System.out.print("The result is: ");
                System.out.println(number_1 + number_2);
                break;

            case 1:
                System.out.println("Subtracting these numbers");
                System.out.print("The result is: ");
                System.out.println(number_1 - number_2);
                break;

            case 2:
                System.out.println("Multiplying these numbers");
                System.out.print("The result is: ");
                System.out.println(number_1 * number_2);
                break;

            case 3:
                System.out.println("Dividing these numbers");
                System.out.print("The result is: ");
                System.out.println(number_1 / number_2);
                break;

            default:
                System.out.println("Invalid input");

        }


    }
}