package javaapplication3;

import java.util.StringTokenizer;
import javax.swing.JOptionPane;

public class JavaApplication3 {

    public static void main(String[] args) {

        String expr;
        int num1, num2, res = 0;

        while ((expr = JOptionPane.showInputDialog("Liczba 1 op Liczba2")) != null) {
            // klasa do rozbioru tekstu na elementy
            StringTokenizer st = new StringTokenizer(expr);

            if (st.countTokens() != 3) {
                continue;
            }

            String snum1 = st.nextToken(), sop = st.nextToken(), snum2 = st.nextToken();

            try {
                num1 = Integer.parseInt(snum1);
                num2 = Integer.parseInt(snum2);
            } catch (NumberFormatException ex) {
                continue;
            }

            if (sop.length() != 1) {
                continue;
            }

            switch(sop)
            {
                case "+":
                    res = num1 + num2;
                    break;

                case "-":
                    res = num1 - num2;
                    break;

                case "*":
                    res = num1 * num2;
                    break;

                case "/":
                    res = num1 / num2;
                    break;


            }

            JOptionPane.showMessageDialog(null, "wynik= "+res);

        }


    }


    }