Java program for quadratic formula.

[Bansi_WADIA]

Hello,
I am new to programming language. I recently started learning java language. In my last tutorial sir has given us program like write java program for quadratic formula. I use various method but I unable to write that program. That's why I asked this question on this forum. So if you have any idea about this please help me.Thanks in advanced.

[Praetor]

I just tried to write java program for quadratic formula. Check whether it works in your computer or not.

import java.util.*;

public class quadratic
{
public static void main(String[] args)
{
Scanner i = new Scanner(System.in);
String e = "( px^2 + qx + r = 0 1 )";

System.out.println("Your equation is " + e);
System.out.println("Please enter the values of coefficients p, q, r, separated by spaces");
System.out.println("p = "); double p = input.nextDouble();
System.out.println("q = "); double q = input.nextDouble();
System.out.println("r = "); double r = input.nextDouble();
System.out.println();

double dis = java.lang.Math.pow(q,2) - (4*p*r);
double r1 = ((-1 * q) + (java.lang.Math.sqrt(discriminant)))/(2*p);
double r2 = ((-1 * q) - (java.lang.Math.sqrt(discriminant)))/(2*p);

System.out.println(" " + e);
System.out.println("The coefficients you entered were " + "\nP = " + p + "\nQ = " + q + "\nR = " + r);
System.out.println();

if(dis > 0)
{
System.out.println("Root1: " + r1);
System.out.println("Root2: " + r2);
}
else if(dis == 0)
{
System.out.println("Root: " + r1);
}
else
{
double rp1complex = (-1 * q)/(2*p);
double rp1complex2 = (java.lang.Math.sqrt(discriminant/(-1)))/(2*p);

System.out.println(rp1complex + " + " + r1complex2 + " i ");
System.out.println(" " + " and ");
System.out.println(rp1complex + " - " + r1complex2 + " i ");
}

}
}

[Katty]

Just try to understand each steps.

import javax.swing.JOptionPane; 

class Main {
    public static void main(String[] args) {
        
        double P, Q, R, r1, r2, disc;
        String IS;
        
       
        System.out.println(" computes reads the quadratic formula." +
                            "\nStandard Form of quadratic equations: Px^2 + Qx + R = 0" +
                            "\n dtermine whether roots are imaginary!\n");
        
        
        IS = JOptionPane.showInputDialog("Px^2 + Qx + R = 0\n enter P:");
           
            P = Double.parseDouble(IS);
     
        IS = JOptionPane.showInputDialog("Px^2 + Qx + C = 0\n enter Q:");
            Q = Double.parseDouble(IS);
        IS = JOptionPane.showInputDialog("Px^2 +Qx + R = 0\n enter R:");
            R = Double.parseDouble(IS);
            
     
        disc = (Math.pow(Q, 2)) - (4*P*R);
        if(disc == 0.0) {           
            root1 = (-Q + Math.sqrt(disc)) / (2 *P);
            JOptionPane.showMessageDialog(null, String.format("There is one root at: %.4f\n\n", root1), "Roots:", JOptionPane.INFORMATION_MESSAGE);
        } 
        else {
            if(disc > 0.0) {       
                root1 = (-Q + Math.sqrt(disc)) / (2 * P);
                root2 = (-Q - Math.sqrt(disc)) / (2 * P);
                JOptionPane.showMessageDialog(null, String.format("There are two real roots at: %.4f and %.4f\n\n", r1, r2), "Roots:", JOptionPane.INFORMATION_MESSAGE);
            }
            else {
                if(disc < 0.0) {  
                    root1 = (-Q + Math.sqrt(-disc)) / (2 * P);
                    root2 = (-Q + Math.sqrt(-disc)) / (2 * P);
                    JOptionPane.showMessageDialog(null, String.format("There are two imaginary roots at: %.4fi and %.4fi\n\n", r1, r2), "Roots:", JOptionPane.INFORMATION_MESSAGE);
                }
            }
        }
        System.exit(0);
        
    }
}

[kelfro]

strictfp class QuadFormula
{
public static void main(String[] args)
{
      
     double p, q, r, discR, r1, r2;

     
     System.out.println("Applying the quadratic formula");
     p = 1d;
     q = 2d;
     r = 3d;

    
     discR = Math.sqrt((q * q) - (4 * p * r));
     System.out.println("Discriminant = " + discR);
    
     if(Double.isNaN(discR))
        System.out.println("Equation has no roots");
     
     if(discr > 0)
     {
        System.out.println("Equation has 2 roots");
        r1 = (-q + discR)/2 * p;
        r2 = (-q - discR)/2 * p;
        System.out.println("1st root = " + r1);
        System.out.println("2nd roor = " + r2);
      }

      if(discR == 0)
      {
        System.out.println("Equation has 1 root");
        r1 = (-q + discR)/2 * p;
        System.out.println("Root = " + r1);
      }

       if(discR < 0)
         System.out.println("Equation has imaginary roots");

}
}

[Zecho]

public static void main (String[] args)
   {
      int p, q, c;  
      double disct, r1, r2;

      Scanner scan = new Scanner (System.in);

      System.out.print (" Coefficient of x squared: ");
      p = scan.nextInt();

      System.out.print (" Coefficient of x: ");
      q = scan.nextInt();

      System.out.print ("Constant: ");
      r = scan.nextInt();

      

      discriminant = Math.pow(q, 2) - (4 * p * r);
      r1 = ((-1 * q) + Math.sqrt(disc)) / (2 * p);
      r2 = ((-1 * q) - Math.sqrt(disc)) / (2 * p);

      System.out.println (" First Root: " + r1);
      System.out.println (" Second Root : " + r2);
   }
}

[Reegan]

public class Quadratic { 

    public static void main(String[] args) { 
        double p = Double.parseDouble(args[0]);
        double q = Double.parseDouble(args[1]);

        double disc1 = p*p - 4.0*q;
        double sqroot =  Math.sqrt(disc1);

        double root1 = (-p + sqr) / 2.0;
        double root2 = (-p - sqr) / 2.0;

        System.out.println(r1);
        System.out.println(r2);
    }
}