calculator using do while loop

import java.util.*;

public class calculator {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int button,a,b;
        do {
            System.out.print(
                    "1 : + (Addition) a + b\n" +
                    "2 : - (Subtraction) a - b\n" +
                    "3 : * (Multiplication) a * b\n" +
                    "4 : / (Division) a / b\n" +
                    "5 : % (Modulo or remainder) a % b\n" +
                    "6 : Exit\n");
            System.out.println("Enter your option(1..6): ");
            button = sc.nextInt();
            if(button==6){
                System.out.println("Exit success..");
                System.exit(0);
            }
            System.out.println("Enter your first number");
            a = sc.nextInt();
            System.out.println("Enter your second number");
            b = sc.nextInt();
            switch (button) {
                case 1:
                    System.out.println("Output is a + b = "+a + b);
                    break;
                case 2:
                    System.out.print("Output is a - b = ");
                    System.out.println(a - b);
                    break;
                case 3:
                    System.out.println("Output is a * b = "+a * b);
                    break;
                case 4:
                    System.out.println("Output is a / b = "+a / b);
                    break;
                case 5:
                    System.out.println("Output is a % b = "+a % b);
                    break;
                default:
                    System.out.println("Enter wrong button");
            }
        }while (button != 6);
    }
}