Question

Write a program in Java to find the roots of a quadratic equation ax²+bx+c=0 with the following specifications: 

Class name: Quad
Data Members: float a,b,c,d (a,b,c are the co-efficients & d is the discriminant), r1 and r2 are the roots of the equation.
Member Methods: 
quad(int x,int y,int z): to initialize a=x,b=y,c=z,d=O
void calculate() : Find d=b²−4ac
If d<0 then display "Roots not possible" otherwise find and display:
r1= `(-"b" + sqrtd)/(2a)` and r2 = `(-b - sqrtd)/(2a)`

Answer 1

import java.util.*;
public class Quad{
float a, b, c, d, r1, r2;

Quad(int x, int y, int z)
{a = x;
b = y;
c = z;
d = 0;
}

void calculate)
{double d, r1 = 0, r2 = 0;
d = Math.sqrt (b * b - 4 * a * c);
if ((d > 0) || (d == 0))
{ r1 = (-b + d) / (2.0 * a);
12 = (-b - d) / (2.0 * a);
System.out.println("The roots are " + r1 + " and " + r2);
}
else System.out.println("The roots are imaginary");
} 

public static void main(String args[])
{Scanner ob = new Scanner(System.in);
System.out.println("Enter the value of a, b, c");
Quad q = new Quad(ob.nextInt(),ob.nextInt(),ob.nextInt());
q.calculate();
}}