Question

How to find square roots of 2 quadratic equations in java?

Answer 1

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");
}
}
}
Output:

$ javac Quadratic_Equation.java
$ java Quadratic_Equation

Given quadratic equation:ax^2 + bx + c
Enter a:2
Enter b:3
Enter c:1
Given quadratic equation:2x^2 + 3x + 1
Roots are real and unequal
First root is:-0.5
Second root is:-1.0