Number Operators - Java

package NestedLoops;

import java.util.Scanner;

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

        int n1 = Integer.parseInt(scanner.nextLine());
        int n2 = Integer.parseInt(scanner.nextLine());
        char sign = scanner.nextLine().charAt(0);
        double res = 0;
        String evenOrOdd = "";

        switch (sign) {
            case '+':
                res = n1 + n2;
                if (res % 2 == 0) {
                    evenOrOdd = "even";
                } else {
                    evenOrOdd = "odd";
                }
                System.out.printf("%d %s %d = %.0f - %s", n1, sign, n2, Math.floor(res), evenOrOdd);
                break;
            case '-':
                res = n1 - n2;
                if (res % 2 == 0) {
                    evenOrOdd = "even";
                } else {
                    evenOrOdd = "odd";
                }
                System.out.printf("%d %s %d = %.0f - %s", n1, sign, n2, Math.floor(res), evenOrOdd);
                //printDefMsg(n1, sign, n2, res, evenOdd(res));
                break;
            case '*':
                res = n1 * n2;
                if (res % 2 == 0) {
                    evenOrOdd = "even";
                } else {
                    evenOrOdd = "odd";
                }
                System.out.printf("%d %s %d = %.0f - %s", n1, sign, n2, Math.floor(res), evenOrOdd);
                //printDefMsg(n1, sign, n2, res, evenOdd(res));
                break;
            case '/':
                if (n2 == 0) {
                    System.out.printf("Cannot divide %d by zero", n1);
                } else {
                    res = n1 * 1.0 / n2;
                    System.out.printf("%d %s %d = %.2f", n1, sign, n2, res);
                }
                //printZeroMsg(n1);
                break;

            case '%':
                if (n2 == 0) {
                    System.out.printf("Cannot divide %d by zero", n1);
                } else {
                    res = n1 % n2;
                    System.out.printf("%d %s %d = %.0f", n1, sign, n2, Math.floor(res));
                }
                break;
            default:
                break;
        }
    }

//    private static String evenOdd(int number){
//        String evenOrOdd = "even";
//        if (number % 2 == 1){
//            evenOrOdd = "odd";
//        }
//        return evenOrOdd;
//    }

//    private static void printZeroMsg(int n1){
//        System.out.printf("Cannot divide %d by zero ", n1);
//    }
//
//    private static void printDefMsg(int n1, char sign, int n2, int res, String evenOdd){
//        System.out.printf("%d %c %d = %d - %s", n1, sign, n2, res, evenOdd);
//    }
}