package question2;
import java.util.Scanner;

public class PolynomialTester {

    public static void main(String[] args) {

        Scanner keyb= new Scanner(System.in);

        System.out.print("Enter degree of polynomial: ");
        int degree=keyb.nextInt();
        if(degree<=0) {
            System.out.print("Invalid degree, re-enter: ");
            degree=keyb.nextInt();
        }

        Polynomial poly1=new Polynomial(degree);
        double input;

        for(int i=0; i<=degree; i++) {
            System.out.print("Enter Coeff for degree "+i+": ");
            input=keyb.nextDouble();
            poly1.setCoefficient(i, input);
        }

        System.out.print("Polynomial: "+poly1.toString());
        boolean exit=false;
        String userInput="";
        double x=0;

        do {
            System.out.println();
            System.out.print("Enter a value of x for which to evaluate the polynomial: ");
            userInput=keyb.next();
            try {
                x=Double.parseDouble(userInput);
                System.out.print("For x ="+x+", polynomial = "+poly1.evaluate(x));
            }catch (NumberFormatException e){
                if (userInput.compareTo("quit") == 0) {
                    exit = true;
                }
                else {
                    exit = false;
                }
            }
        }while(!exit);

        System.out.print("Created copy of polynomial");

        Polynomial poly2=new Polynomial(poly1);



        System.out.println();
        System.out.print("Polynomials are equal: "+poly1.equals(poly2));
        System.out.println();
        System.out.println("To make them unequal enter a index and coefficent to change:");
        int index=keyb.nextInt();
        input=keyb.nextDouble();
        poly2.coefficients[index]=input;
        System.out.println(poly2.coefficients[index]);
        System.out.print("Polynomials are equal: "+poly1.equals(poly2));
    }
}