Java Program In this lab, you will construct a class called QuadraticSolver that

Question

Java Program

In this lab, you will construct a class called QuadraticSolver that will compute the real roots of a quadratic function (f(x) =ax^2 + bx +c ).

The class will implement the following methods:

A default constructor that initializes a legitimate quadratic function.

An overloaded constructor that takes the values of a, b, and c in the function f(x) = ax^2 + bx

+c . This method throws a QuadraticException in the case where the input does not

define a quadratic function.

A method that computes the discriminant ( b^2 - 4ac).

Boolean methods determining whether the solutions of the quadratic equation ax^2+ bx +c =

0 have real or non-real solutions.

Two methods, one for each real root of the equation ax^2+bx + c = 0. Each method will throw

a NonRealException when the root is a non-real value.

A toString method that (reasonably) prints the quadratic function.

The classes QuadraticException and NonRealException have been provided. Implement a main method in a separate class to test your implementation.

Explanation / Answer

QuadraticException.java

public class QuadraticException extends Exception {

QuadraticException(String mesg)

{

System.out.println(mesg);

}

}

_____________________

NonRealException.java

public class NonRealException extends Exception {

NonRealException(String mesg)

{

System.out.println(mesg);

}

}

________________________

QuadraticSolver.java

public class QuadraticSolver {
private int a;
private int b;
private int c;

public QuadraticSolver() {
super();

}

public QuadraticSolver(int a, int b, int c) throws QuadraticException {
super();
if (a == 0) {
throw new QuadraticException(
"** Coefficient X^2 must not be zero **");
} else {
this.a = a;
this.b = b;
this.c = c;
}
}

public boolean calDiscrimininant() {
boolean bool = false;
if (Math.pow(b, 2) - 4 * a * c < 0)
bool = false;
else if (Math.pow(b, 2) - 4 * a * c >= 0)
bool = true;
return bool;
}

public double findRoot1() throws NonRealException {
if (!calDiscrimininant())
throw new NonRealException("No Real Roots");
else
return ((-b + Math.pow(b, 2) - 4 * a * c) / (2 * a));
}

public double findRoot2() throws NonRealException {
if (!calDiscrimininant())
throw new NonRealException("No Real Roots");
else
return ((-b - Math.pow(b, 2) - 4 * a * c) / (2 * a));
}

@Override
public String toString() {
return "(" + a + ")x^+(" + b + ")x +" + c + " = 0";
}

}

_______________

Test.java

import java.util.Scanner;

public class Test {

public static void main(String[] args) {
//Declaring variables
int a = 0, b = 0, c = 0, num;

//Scanner class object is used read the inputs entered by the user
Scanner sc = new Scanner(System.in);

QuadraticSolver qs;
while (true) {
//Getting the number 'a' entered by the user
System.out.print(" Enter Number a:");
a = sc.nextInt();

//Getting the number 'b' entered by the user
System.out.print("Enter Number b:");
b = sc.nextInt();

//Getting the number 'c' entered by the user
System.out.print("Enter Number c:");
c = sc.nextInt();
try {
qs = new QuadraticSolver(a, b, c);
System.out.println("Root#1 :" + qs.findRoot1());
System.out.println("Root#2 :" + qs.findRoot2());
break;
} catch (QuadraticException e) {
continue;
} catch (NonRealException e) {
continue;
}
}

}

}

__________________

Output:

Enter Number a:0
Enter Number b:8
Enter Number c:8
** Coefficient X^2 must not be zero **

Enter Number a:3
Enter Number b:2
Enter Number c:5
No Real Roots

Enter Number a:1
Enter Number b:-3
Enter Number c:-4
Root#1 :14.0
Root#2 :5.0

_____________Could you rate me well.Plz .Thank You

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