Polinom

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;



class Polinom{
    private:
        int grad;
        float *coef;
    public:
        Polinom(int grad=0);
        Polinom(const Polinom &p);
        ~Polinom();
        void citire();
        void afisare();
        float valPunct(float x);
        Polinom operator +(const Polinom &p);
        Polinom& operator =(const Polinom &p);
};

Polinom::Polinom(int grad){
        this->grad=grad;
        this->coef=new float[grad+1];
        for(int i=0; i<=grad+1; i++){
            this->coef[i]=0;
        }
        cout<<"C cu param"<<endl;
}
Polinom::Polinom(const Polinom &p){
    this->grad=p.grad;
    this->coef=new float[p.grad+1];
    for(int i=0; i<=p.grad+1; i++){
            this->coef[i]=p.coef[i];
        }
    // de copiat coeficientii
    cout<<"C de copiere"<<endl;
}
Polinom::~Polinom(){
    if(coef!=0){
        delete coef;
    }
    cout<<"Destructor"<<endl;
}
void Polinom::citire(){
    cout<<"Dati gradul polinomului"<<endl;
    int temp;
    cin>>temp;
    if(temp>grad){
        delete coef;
        this->coef=new float[temp+1];
    }
    grad=temp;
    //Daca citesc gradul trebuie realocat tabloul.

    cout<<"Dati coeficientii:"<<endl;
    for(int i=0; i<=grad;i++){
        cout<<"Dati coef lui X^"<<i<<"= "<<endl;
        cin>>coef[i];
    }
}
void Polinom:: afisare(){
    for(int i=0; i<=grad; i++){
        cout<<coef[i]<<"*X^"<<i<<" + ";
    }
    cout<<endl;
}

Polinom Polinom ::operator +(const Polinom &p){
    int max=(this->grad>p.grad) ? this->grad : p.grad;
    Polinom suma(max);
    for (int i=0; i<=this->grad; i++){
        suma.coef[i]+=this->coef[i];
    }
    for (int i=0; i<=p.grad; i++){
        suma.coef[i]+=p.coef[i];
    }
return suma;
}

Polinom & Polinom::operator=(const Polinom &p){//p este obiectul din dreapta lui =
    if(this != &p){
        if(this->grad<p.grad){
            delete this->coef;
            this->coef=new float[p.grad+1];
        }

        this->grad=p.grad;
        for(int i=0; i<=p.grad; i++){
            this->coef[i]=p.coef[i];
        }
    }
    return *this;
}

float Polinom:: valPunct(float x){
    int i;
    float suma=0;
    for(i=0; i<=grad; i++){
        suma+=this->coef[i]*pow(x,i);
    }
    return suma;
}

int main(){
    Polinom p,q;
    p.citire();
    p.afisare();
    q.citire();
    q.afisare();
    Polinom rez;
    rez=p+q;
    cout<<"Suma celor 2 polinoame este: ";
    rez.afisare();
    cout<<endl;
    return 0;
}