Java program to print all real solutions to the quadratic eq. ax2+b+c=0. Read a,b,c values and use the formula (–b+sqrt(b2 4ac))/2a

Quadratic.java

import java.io.*;
class Quadratic
{
	public static void main(String args[]) throws Exception
	{

		double a,b,c;
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		
		System.out.println("Enter the value of a:");
		a=Double.parseDouble(br.readLine());
		
		System.out.println("Enter the value of b:");
		b=Double.parseDouble(br.readLine());
		
		System.out.println("Enter the value of c:");
		c=Double.parseDouble(br.readLine());
		
		double delta=(b*b)-(4*a*c);
		
		if(a==0)
		{
			System.out.println("No solution possible");
		}
		else if ( delta == 0 ) 
		{ 
			double root = - b / (2 * a); 
			System.out.println("The Real roots are equal:" + root ); 
		} 

		else if(delta < 0)
		{
				System.out.println("The roots are imaginary"); 
		}
		else
		{
			double Root1 = (- b + Math.sqrt(delta)) / (2 * a); 
			double Root2 = (- b - Math.sqrt(delta)) / (2 * a); 
			System.out.println("The Real roots are unequal " + Root1 + " and " + Root2); 
		}	
	}
}

OUTPUT

javac Quadratic.java

java Quadratic
Enter the value of a:
2
Enter the value of b:
5
Enter the value of c:
3
The Real roots are unequal -1.0 and -1.5

java Quadratic
Enter the value of a:
0
Enter the value of b:
1
Enter the value of c:
2
No solution possible

java Quadratic
Enter the value of a:
1
Enter the value of b:
2
Enter the value of c:
1
The Real roots are equal: -1.0