Write a Java Swing application that raises a floating-point number into an integ
ID: 3799714 • Letter: W
Question
Write a Java Swing application that raises a floating-point number into an integer power. The application should handle exceptions caused by invalid input and display warnings by using JOptionPane pop-up windows. In this case the result field should display "NaN" (Not a Number).Moreover, if the resulting number appears to be an integer (e.g., 2.03 = 8), it should be shown as an integer without the decimal point and the tailing zeros.
Swingtemplate provided
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
public class Swingtemplate
{
public static void main(String[] args)
{
SwingApp app = new SwingApp(400, 400); // set app window size
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class SwingApp extends JFrame //"extends"
{
private final DrawPanel panel; // class variable
public SwingApp(int width, int height) // class constructor
{
super(); // call to super class constructor
Container pane = super.getContentPane(); // create layout, set colors
panel = new DrawPanel(); // add GUI components
panel.setBackground(Color.yellow); // set the color yellow as the background
//------------------------- add other GUI components to the panel-----------------------------
pane.add(panel); // add panel to the main app container
Toolkit toolkit = Toolkit.getDefaultToolkit(); // optionally position JFrame
Dimension screenSize = toolkit.getScreenSize(); // puts the popup in the middle of the screen
super.setLocation((screenSize.width - width)/2, (screenSize.height - height)/2);
super.setTitle("Swing app"); // set desired window title
super.setSize(width, height); // set desired window size
super.setVisible(true); // make the app window visible
}
}
class DrawPanel extends JPanel // main window panel
{
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g); // must be the 1st line
//----------------- add here other code for drawing on panel-----------------------------
}
}
Explanation / Answer
import java.util.Scanner; public class Quadratic_Equation { public static void main(String[] args) { int a, b, c; double root1, root2, d; Scanner s = new Scanner(System.in); System.out.println("Given quadratic equation:ax^2 + bx + c"); System.out.print("Enter a:"); a = s.nextInt(); System.out.print("Enter b:"); b = s.nextInt(); System.out.print("Enter c:"); c = s.nextInt(); System.out.println("Given quadratic equation:"+a+"x^2 + "+b+"x + "+c); d = b * b - 4 * a * c; if(d > 0) { System.out.println("Roots are real and unequal"); root1 = ( - b + Math.sqrt(d))/(2*a); root2 = (-b - Math.sqrt(d))/(2*a); System.out.println("First root is:"+root1); System.out.println("Second root is:"+root2); } else if(d == 0) { System.out.println("Roots are real and equal"); root1 = (-b+Math.sqrt(d))/(2*a); System.out.println("Root:"+root1); } else { System.out.println("Roots are imaginary"); } } }