initialize a variable

Hi Experts,

 I got an error  "variable c might have not been initialized at line 00 & line 01" .... does anyone know how to fix it ??? thanks !
   private int size = 0 ;
   private int _coef[] ;
    /** Creates a new instance of Polynomial */
   public Polynomial() {
    /** Constructor from an array of coefficients c[] where c[i] is the coefficient of the x^i term */
  public Polynomial(int[] coef) {
    size = coef.length ;
    _coef = new int[size] ;
    for(int i=0; i<size; i++){ _coef[i] = coef[i] ;}

public Polynomial add(Polynomial b) {
    int dega = ;
    int degb = ;
    int deg_max = (dega > degb) ? dega: degb ;
    int deg_min = (dega < degb) ? dega: degb ;
    Polynomial c ;
    for(int i= 0; i<= deg_max; i++){    // line 00
      c._coef[i] = 0 ;}
    for(int i= 0; i<= deg_min; i++){
      c._coef[i] = this._coef[i] + b._coef[i] ;}   // line 01
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u need to initialise c

    Polynomial c = new Polynomial(new int[deg_max]);

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hi meow,

u need to instantiate the object c in the method:

public Polynomial add(Polynomial b)
 Polynomial c = new Polynomial();

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