Java Program to Find Roots of a Quadratic Equation

C Program also avilable as C Program to Find Roots of a Quadratic Equation   

import java.io.*;
class Quad
{
    public static void main(String args[]) throws IOException
    {
        int a,b,c;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a,b,c values: ");
        a= Integer.parseInt(br.readLine());
        b= Integer.parseInt(br.readLine());
        c= Integer.parseInt(br.readLine());

        if((a==0)&&(b==0)&&(c==0))
        {
            System.out.println("Enter atleast two non-zero co-efficients");
        }
        else
        {
            float r1=0,r2=0;
            if(a==0)
            {
                r1= (float)-c/b;
                System.out.println("The roots are:"+r1);
            }
            else
            {
                float d=(b*b)-(4*a*c);

                if(d<0)
                {
                    System.out.println("Roots are imaginary");
                    float real=(float)(-b)/(2*a);
                    float img=(float)(Math.sqrt(Math.abs(d)))/(2*a);
                    System.out.println("r1="+real+"+i"+img);
                    System.out.println("r2="+real+"-i"+img);
                }
                else
                {
                    r1=(float)(-b+Math.sqrt(d))/(2*a);
                    r2=(float)(-b-Math.sqrt(d))/(2*a);
                    if(d==0)
                    {
                        System.out.println("Roots are real and equal");
                    }
                    else
                    {
                        System.out.println("Roots are real and different");
                    }
                    System.out.println("r1="+r1);
                    System.out.println("r2="+r2);
                }

            }
        }
    }
}

 OUTPUT:

Enter a,b,c values:
1
4
1
Roots are real and different
r1= -0.2679492
r2= -3.732051