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# Untitled

a guest Jan 21st, 2019 53 Never
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1. public class Poly {
2.    //OVERVIEW:
3.     ...
4.    private int[ ] trms;
5.    private int deg;
6.
7.    // constructors
8.    public Poly ( ) {
9.       //EFFECTS: Initializes this to be the zero polynomial.
10.       trms = new int[1]; deg = 0;
11.    }
12.
13.    public Poly (int c, int n) throws NegativeExponentException {
14.       //EFFECTS: If n < 0 throws NegativeExponentException else
15.      //initializes this to be the Poly cxn.
16.       if (n < 0)
17.          throw new NegativeExponentException("Poly(int,int) constructor");
18.       if (c == 0) { trms = new int[1]; deg = 0; return; }
19.       trms = new int[n+1];
20.       for (int i = 0; i < n; i++) trms[i] = 0;
21.       trms[n] = c;
22.       deg = n;
23.    }
24.
25.    private Poly (int n) { trms = new int[n+1]; deg = n; }
26.
27.    // methods
28.    public int degree ( ) {
29.       //EFFECTS: Returns the degree of this, i.e., the largest exponent
30.      //   with a non-zero coefficient. Returns 0 if this is the zero Poly.
31.       return deg;
32.    }
33.
34.    public int coeff (int d) {
35.       //EFFECTS: Returns the coefficient of the term of this whose exponent is d.
36.       if (d < 0 || d > deg) return 0; else return trms[d];
37.    }
38.
39.    public Poly sub (Poly q) throws NullPointerException {
40.       //EFFECTS: If q is null throws NullPointerException else
41.      // returns the Poly this - q.