Challenge: Simple Calculator

Lab Java Intermediate 20 points

Read a number, an operator (+, -, * or /) and another number, and print the result. Use switch. If the operator is / and the second number is 0, print Cannot divide by zero. For any other operator print Unknown operator.

Input

One line: a op b, e.g. 8 / 2. a and b are whole numbers.

Output

The result as a whole number (use integer division), or one of the messages.

Example

Input

8 / 2

Output

Sample input available Sample output available

Editor

Java

Hints

Read the operator with sc.next() as a String.

switch works on Strings: case "+":

Don't forget break after each case.

Solution explanation

The switch picks the operation, and an if inside the "/" case guards against dividing by zero.

Show solution

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        String op = sc.next();
        int b = sc.nextInt();
        switch (op) {
            case "+":
                System.out.println(a + b);
                break;
            case "-":
                System.out.println(a - b);
                break;
            case "*":
                System.out.println(a * b);
                break;
            case "/":
                if (b == 0) {
                    System.out.println("Cannot divide by zero");
                } else {
                    System.out.println(a / b);
                }
                break;
            default:
                System.out.println("Unknown operator");
        }
    }
}

Output

Answer