public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.println("Enter a operator :");

int ans = 0;

while(true) {

char op = input.next().trim().charAt(0);

if (op == '+' || op == '-' || op == '*' || op == '/' || op == '%') {

System.out.println("Enter two numbers :");

int num1 = input.nextInt();

int num2 = input.nextInt();

if (op == '+') {

ans = num1 + num2;

}

if (op == '-') {

ans = num1 - num2;

}

if (op == '*') {

ans = num1 * num2;

}

if (op == '/') {

if (num2 != 0) {

ans = num1 / num2;

}

}

if (op == '%') {

ans = num1 % num2;

} else if (op == 'x' || op == 'X') {

}

break;

}

}

System.out.println(ans);

}