Using GUI (Java), write the program that implements the algorithm for computing

ID: 3621615 • Letter: U

Question

Using GUI (Java), write the program that implements the algorithm for computing the roots of a quadratic equation. The user is prompted to enter the coefficients a, b, c as floating-point numbers, where a does not equal to 0. The program should be implemented as follows:

1. Name the class as "QuadraticEquation"

2.The main method should be used only to get the coefficient values, to echo (display) the coefficient values, check if coefficient a = 0, if so, displays: "Sorry! Coefficient a cannot be zero." then the program should exit, to call methods ("discriminant" and "checkDiscriminant") and to display the result.

3. Use a method called "discriminant" to compute the discriminant.

4. use a method called "checkDiscriminant" that distinguishes the different types of roots for the equation

Case1: if the discriminant < 0, the program displays: " The discriminant is negative. Equation has only complex roots.

Case2: if the discriminant = 0, the program calculates the root then displays: "The discriminant is zero. Equation has two equal roots x = root1"

Case3: if the discriminant > 0, the program calculates the roots then displays: "The discriminant is non-zero and positive. Equation has two distinct roots x1=root1 and x2=root2"

Note that root1 and root2 has to be calculated before the values are displayed.

No computation should take place if a=0. The program should display "Sorry! Coefficient a cannot be zero." and exits

Explanation / Answer

Dear,

Here is the code
import javax.swing.JOptionPane;
public class QuadraticRoots
{
public static void main(String args[])
{
  int a,b,c;
  //obtain first number from user
  String firstnumber = JOptionPane.showInputDialog("Enter coefficient a");
  a=Integer.parseInt(firstnumber);
  //obtain second number from user
  String secondnumber = JOptionPane.showInputDialog("Enter coefficient b");
  b=Integer.parseInt(secondnumber);
  //obtain third number from user
  String thirdnumber = JOptionPane.showInputDialog("Enter coefficient c ");
  c=Integer.parseInt(thirdnumber);
  //function call to calcuate roots
  discriminant(a,b,c);
  //exit program
  System.exit(0);
}
public static void discriminant(int a ,int b,int c)
{
  int d=((b*b)-(4*a*c));
  checkDiscriminant(d,a,b,c);
}
public static void checkDiscriminant(int d,int a ,int b, int c)
{
  if(d==0)
   JOptionPane.showMessageDialog(null,"The discreminant is zero Equation has two equal Roots x"+-(b/(2*a)));
  else if((d)>0)
  {
   double root1= (-b + Math.sqrt(d)) / (2*a);
   double root2= (-b + Math.sqrt(d)) / (2*a);
   JOptionPane.showMessageDialog(null,"The discreminant is greater than zero Root1 ="+root1+"Root2 ="+root2);
  }
  else
   JOptionPane.showMessageDialog(null,"Roots are complex");
}
}

Hope this will help you

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Using GUI (Java), write the program that implements the algorithm for computing

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