// Introduction to Software Testing
// Authors: Paul Ammann & Jeff Offutt
// Chapter 2, section 2.4, page 71

// Program to compute the quadratic root for two numbers
import java.lang.Math;

class Quadratic
{
   private static double Root1, Root2;

public static void main (String[] argv)
{
   int X, Y, Z;
   boolean ok;
   if (argv.length == 3)
   {
      try
      {  // The book has a typo in this example,
         // argv[] must start at 0, not 1.
         // This version has been corrected.
         X = Integer.parseInt (argv[0]);
         Y = Integer.parseInt (argv[1]);
         Z = Integer.parseInt (argv[2]);
      }
      catch (NumberFormatException e)
      {
         System.out.println ("Inputs not three integers, using 8, 10, -33.");
         X = 8;
         Y = 10;
         Z = -33;
      }
   }
   else
   {
      System.out.println ("Inputs not three integers, using 8, 10, -33.");
      X = 8;
      Y = 10;
      Z = -33;
   }
   ok = Root (X, Y, Z);
   if (ok)
      System.out.println
         ("Quadratic: Root 1 = " + Root1 + ", Root 2 = " + Root2);
   else
      System.out.println ("No solution.");
}

// Finds the quadratic root, A must be non-zero
private static boolean Root (int A, int B, int C)
{
   double D;
   boolean Result;
   D = (double)(B*B) - (double)(4.0*A*C);
   if (D < 0.0)
   {
      Result = false;
      return (Result);
   }
   Root1 = (double) ((-B + Math.sqrt(D)) / (2.0*A));
   Root2 = (double) ((-B - Math.sqrt(D)) / (2.0*A));
   Result = true;
   return (Result);
} // End method Root

} // End class Quadratic