Aim: To write a Java program that prints all real solutions to the quadratic equation ax2+bx+c=0. Read in a, b, c and use the quadratic formula. If the discriminant b2 -4ac is negative, display a message stating that there are no real solutions.

import java.io.*;

class Quadratic

{

  public static void main(String args[])throws IOException

  {

  int a,b,c,disc;

 double x1,x2;

InputStreamReader obj=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(obj);

System.out.println("enter a,b,c values");

a=Integer.parseInt(br.readLine());

b=Integer.parseInt(br.readLine());

c=Integer.parseInt(br.readLine());

disc=(b*b)-(4*a*c);

if(disc==0)

  {

System.out.println("roots are real and equal ");

x1=x2=-b/(2*a);

System.out.println("roots are "+x1+","+x2);

  }

else if(disc>0)

  {

 System.out.println("roots are real and unequal");

 x1=(-b+Math.sqrt(disc))/(2*a);

 x2=(-b+Math.sqrt(disc))/(2*a);

System.out.println("roots are "+x1+","+x2);

  }

else

 {

 System.out.println("roots are imaginary");

  }

}