import java.util.Scanner;

public class Calculator {
	public static void main(String[] args) {
        int number1, number2;
        int result = 0;
        String operator;

        System.out.println("Operations are: “add”, “sub”, “mul”, “div”");
        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter a number:");
        number1 = scanner.nextInt();

        System.out.println("Enter a number:");
        number2 = scanner.nextInt();

        System.out.println("Enter an operation:");
        operator = scanner.next();

        switch(operator) {
            case "add": result = number1 + number2;
                break;

            case "sub": result = number1 - number2;
                break;

            case "mul": result = number1 * number2;
                break;

            case "div": result = number1 / number2;
                break;

            default: System.out.println("wrong input");
                break;
        }

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