Exercice Polynome

public class Polynome{

     private double coef[];

     private int degre ;
     // degre = (coef.length -1)
     public  Polynome(int d , double [] tab){

              degre=d;
              coef=tab;
          }

     public Polynome Ajouter(Polynome P){

        if((P.coef).length==(this.coef).length){
             for(int i=0;i<(P.coef).length;i++){
                 P.coef[i] = P.coef[i]+this.coef[i];
             }
         }
         else {
             if((P.coef).length<(this.coef).length){
                 for(int i=0;i<(P.coef).length;i++){
                    this.coef[i]=P.coef[i]+this.coef[i];
                 }
             }
             else{
                 for(int i=0;i<(this.coef).length;i++){
                    P.coef[i]=P.coef[i]+this.coef[i];
                 }

             }
         }
        int d;
        if((P.degre)>this.degre){
            d=P.degre;
        }
        else{
            d=this.degre;
        }
        double tab[]=new double[(P.coef).length+(this.coef).length];
        if((P.coef).length>=(this.coef).length){
            tab=P.coef;
        }
        else{
            tab=this.coef;
        }
        Polynome A= new Polynome(d,tab);
        System.out.println(A);
        return A;

     }

     public double Evaluer(double x){
         double a=coef[0]+x*coef[1];
         double sum=0 ;
         for(int i=2;i<coef.length;i++){

             sum=sum+((Math.pow(x,i))*coef[i]);

         }

         sum=a+sum;
         System.out.println(sum);
         return sum;


          }

    public String toString(){
        String s="";
        for (int i=1;i<coef.length;i++){
            s+=" + "+coef[i]+"X"+"^"+i;
        }
        return coef[0]+" "+s;

    }

}
public class Test{


    public static void main(String [] args){

     double x[]={5,2,2,7,7,1};
     double x1[] ={1,3,6,5};
        Polynome P1 = new Polynome(6,x);

       Polynome P2 = new Polynome( 5,x1);

       System.out.println(P1);
       System.out.println(P2);
       System.out.print("Evaluer x dans P1 :");
       P1.Evaluer(5);
       System.out.print("Evaluer x dans P2 :");
       P2.Evaluer(6);
       P2.Ajouter(P1);



    }
}