package chapter.pkg4;
import javax.swing.JOptionPane;
import java.util.Scanner;

public class Chapter4 {

    public static void main(String[] args) 
    {
        long n = 1000000;
        //JOptionPane.showMessageDialog(null, n * n);
        byte small = 7;
        long result = n * n;
        //JOptionPane.showMessageDialog(null, result);
        
        double f = 4.35;
        //JOptionPane.showMessageDialog(null, 100 * f);
        double answer = f * 100;
        //if (answer == 435) {}
        
        double balance = 100;  // no problem
        int balance2 = (int)13.9999;  // problem
        //JOptionPane.showMessageDialog(null, balance2);
        
        final double NICKEL_VALUE = 0.05;
        
        int items = 1;
        items++; // increments by 1
        items += 1;  // same thing
        items--;  // decrements by 1
        items -= 1; // same thing
        
        // integer division
        JOptionPane.showMessageDialog(null, "7/4: " + 7/4);
        JOptionPane.showMessageDialog(null, "7.0/4: " + 7.0/4);
        JOptionPane.showMessageDialog(null, "(double)7/4: " + (double)7/4);
        
        //modular division
        JOptionPane.showMessageDialog(null, "7 % 4: " + 7 % 4);
         
        // powers and roots
        JOptionPane.showMessageDialog(null,Math.pow(3, 4));
        JOptionPane.showMessageDialog(null,Math.sqrt(81));
        JOptionPane.showMessageDialog(null,Math.floor(3.9));
        JOptionPane.showMessageDialog(null,Math.round(3.9));
         
        //JOptionPane.showMessageDialog(null,"Hello".length());
        // concatenation
        String name = "Dave";
        String msg = "Hello, " + name;
        JOptionPane.showMessageDialog(null,msg);
        
        String a = "Agent";
        int n2 = 7;
        String bond = a + n2;
        JOptionPane.showMessageDialog(null,bond);
        
        // how to convert from STring to int
        String value = "19";
        int m = Integer.parseInt(value);
        JOptionPane.showMessageDialog(null,m * m);
        
        String value2 = "3.14159";
        double mm = Double.parseDouble(value2);
        JOptionPane.showMessageDialog(null,mm / 2);
        
        String today = "Happy Friday, Metuchen!";
        String msg = today.substring(0, 7);
        JOptionPane.showMessageDialog(null, msg);
        msg = today.substring(7);
        JOptionPane.showMessageDialog(null, msg);
        
        Scanner in = new Scanner(System.in);
        System.out.println("How old are you? ");
        int age = in.nextInt(); 
    }
}