public class PolynomialChecker

{

  public static void main(String[] args)

  {

    int errorCount = 0;

    

    double[] coeffs = new double[7];

    coeffs[0] = 2.0;

    coeffs[1] = 5.0;

    coeffs[2] = 0;

    coeffs[3] = 0;

    coeffs[4] = 1.0;

    coeffs[5] = 0;

    coeffs[6] = 0;

    

    System.out.println("Starting PolynomialChecker...");

    System.out.println("...");

    System.out.println("");

    

    System.out.println("Creating a Polynomial, P1, with coefficients 2,5,0,0,1,0,0");

    System.out.println("...");

    Polynomial p = new Polynomial(coeffs);

    System.out.println("");

    

    System.out.println("Checking P1 degree");

    System.out.println("...");

    int deg = p.getDegree();

    if(deg != 4)

    {

      errorCount++;

      System.out.println("ERROR: getDegree returned " + deg + " instead of 4");

    }

    System.out.println("");

    

    System.out.println("Evaluating P1 at x=3.5");

    System.out.println("...");

    double ans = p.evaluate(3.5);

    if(Math.abs(ans - 169.5625) > .0002)

    {

      errorCount++;

      System.out.println("ERROR: evaluation returned " + ans + " instead of 169.5625");

    }

    System.out.println("");

    

    double[] coeffs2 = new double[11];

    coeffs2[0] = 2.0;

    coeffs2[1] = 5.0;

    coeffs2[2] = 0;

    coeffs2[3] = 0;

    coeffs2[4] = 1.0;

    coeffs2[5] = 0;

    coeffs2[6] = 0;

    coeffs2[7] = 0;

    coeffs2[8] = 0;

    coeffs2[9] = 0;

    coeffs2[10] = 0;

    

    System.out.println("Creating a Polynomial, P2, with coefficients 2,5,0,0,1,0,0,0,0,0,0");

    System.out.println("...");

    Polynomial p2 = new Polynomial(coeffs2);

    System.out.println("");

    

    System.out.println("Comparing P2 with P1 (should be the same)");

    System.out.println("...");

    boolean comp = p.equals(p2);

    boolean comp2 = p2.equals(p);

    if(comp == false)

    {

      errorCount++;

      System.out.println("ERROR: calling P1.equals(P2) returned false");

    }

    if(comp2 == false)

    {

      errorCount++;

      System.out.println("ERROR: calling P2.equals(P1) returned false");

    }

    System.out.println("");

    

    double[] coeffs3 = new double[7];

    coeffs3[0] = 1.0;

    coeffs3[1] = 0;

    coeffs3[2] = 2;

    coeffs3[3] = 5.0;

    coeffs3[4] = 1;

    coeffs3[5] = 0;

    coeffs3[6] = 0;

    

    System.out.println("Creating a Polynomial, P3, with coefficients 1,0,2,5,1,0,0");

    System.out.println("...");

    Polynomial p3 = new Polynomial(coeffs3);

    System.out.println("");

    

    System.out.println("Comparing P3 with P1 (should be different)");

    System.out.println("...");

    comp = p.equals(p3);

    comp2 = p3.equals(p);

    if(comp == true)

    {

      errorCount++;

      System.out.println("ERROR: calling P1.equals(P3) returned true");

    }

    if(comp2 == true)

    {

      errorCount++;

      System.out.println("ERROR: calling P3.equals(P1) returned true");

    }

    System.out.println("");

    

    double[] coeffs4 = new double[2];

    coeffs[0] = 0;

    coeffs[1] = 0;

    

    System.out.println("Creating a Polynomial, P4, with coefficients 0,0");

    System.out.println("...");

    Polynomial p4 = new Polynomial(coeffs4);

    System.out.println("");

    

    System.out.println("Checking that P4 has degree 0");

    System.out.println("...");

    deg = p4.getDegree();

    if(deg != 0)

    {

      errorCount++;

      System.out.println("ERROR: P4 returned degree " + deg + " instead of 0");

    }

    System.out.println("");

    

    System.out.println("Comparing P4 with P1 (should be different)");

    System.out.println("...");

    comp = p.equals(p4);

    comp2 = p4.equals(p);

    if(comp == true)

    {

      errorCount++;

      System.out.println("ERROR: calling P1.equals(P4) returned true");

    }

    if(comp2 == true)

    {

      errorCount++;

      System.out.println("ERROR: calling P4.equals(P1) returned true");

    }

    System.out.println("");

    

    System.out.println(errorCount + " errors reported");

  }

}