public class QuadraticEquation {
  // a quadratic equation a*x^2 + b*x + c = 0
  
  double a;
  double b;
  double c;
    /* QuadraticEquation()
    {
    }*/
         QuadraticEquation(double a1, double b1, double c1) {
    // create a new quadratic equation with the given coefficients
    a = a1;
    b = b1;
    c = c1;
    }
  
  private String toSignedString(double d) {
    // creates string from double value with explicit sign
    if (d >= 0) {
      return("+ " + d);
    } else {
      return("- " + (-d));
    }
  }      


private double discriminant() {
    // the discriminant of the equation
    return(b*b/(4*a*a) - c/a); 
  }


  double[] getSolution() {
    // returns vector of solution values
    double a1,d,dRoot,result[];

    a1 = -b/(2*a);
    d = discriminant();

    if (d > 0) {
      result = new double[2];
      dRoot = Math.sqrt(d);
      result[0] = a1 + dRoot;
      result[1] = a1 - dRoot;
    } 
    else if (d == 0) {
      result = new double[1];
      result[0] = a1;
    }
    else {
      // d<0: result is empty
      result = new double[0];
    }
    
    return(result);
  }




  void print1() {
    // print the equation to the screen
   //    System.out.println(a + "*x^2 + "+ b + "*x + " + c);
System.out.println(a + "*x^2 "+ toSignedString(b) + "*x " + toSignedString(c));
  }

  void print2() {
    // print this to the screen
    System.out.println("it works !");
  }
static void print3() {
    // print this to the screen
    System.out.println("Yes it really works !");
  }
}