[Mr.Ahmad]

الحل النموذجي :

import javax.swing.JOptionPane;

public class Main {

    static private double Check(String txt, String p) {
        double x, y;
        x = Double.parseDouble(txt.substring(0, txt.indexOf(p)));
        y = Double.parseDouble(txt.substring(txt.indexOf(p) + 1, txt.length()));
        if (p.equals("+")) {
            return x + y;
        } else if (p.equals("-")) {
            return x - y;
        } else if (p.equals("*")) {
            return x * y;
        } else if (p.equals("/")) {
            if (y == 0) return 0;
            return x / y;
        } else if (p.equals("%")) {
            if (y == 0) return 0;
            return x % y;
        }
        return 0;
    }

    public static void main(String[] args) {
        for (;;) {
            String txt = JOptionPane.showInputDialog("Enter the Arithmetic Expression :");
            double result;
            if (txt.indexOf("+") != -1) {
                result = Check(txt, "+");
            } else if (txt.indexOf("-") != -1) {
                result = Check(txt, "-");
            } else if (txt.indexOf("*") != -1) {
                result = Check(txt, "*");
            } else if (txt.indexOf("/") != -1) {
                result = Check(txt, "/");
            } else if (txt.indexOf("%") != -1) {
                result = Check(txt, "%");
            } else {
                result = 0;
            }
            JOptionPane.showMessageDialog(null, result);
        }
    }
}