POO persoana student

#include<iostream>
#include<string.h>
using namespace std;
# define MAX 50

class Persoana {
protected:
    char *nume;
    int varsta;
public:
    Persoana(const char *nume="", int varsta=0);
    Persoana(const Persoana &p);
    ~Persoana();
    void setNume(const char *nume);
    Persoana &operator =(const Persoana &p);
    friend istream& operator >>(istream& in, Persoana &p);
    friend ostream& operator <<(ostream& out, const Persoana &p);

};

Persoana::Persoana(const char *nume, int varsta) {
    this->nume=new char[strlen(nume)+1];
    strcpy(this->nume, nume);
    this->varsta=varsta;
}
Persoana::Persoana(const Persoana &p) {
    this->nume=new char[strlen(p.nume)+1];
    strcpy(this->nume, p.nume);
    this->varsta=p.varsta;
}
Persoana::~Persoana() {
    delete[]nume;
}

void Persoana::setNume(const char *nume) {
    if(strlen(this->nume)<strlen(nume)) {
        ///verificam ce camp este mai mare-cel al numelui actual sau al lui p, eventual stergem pe cel curent si realocam
        delete []this->nume;
        this->nume=new char[strlen(nume)];
    }
    strcpy(this->nume, nume);
}
Persoana& Persoana::operator =(const Persoana &p) {

    if(this!=&p) {
        setNume(p.nume);
        this->varsta=p.varsta;
    }
    return *this;
}
istream& operator >>(istream& in, Persoana &p) { ///p nu este pointer, deci se scrie p.nume, p.varsta
    char temp[100];
    cout<<"Nume:";
    in>>temp;
    p.setNume(temp);
    cout<<"Varsta:";
    in>>p.varsta;
    return in;
}
ostream& operator <<(ostream& out, const Persoana &p) {
    out<<"----Persoana----"<<endl;
    out<<"Nume:" << p.nume<<endl;
    out<<"Varsta:" << p.varsta<<endl;
    return out;
}


class Student:public Persoana {
protected:
    int an;
    char *specializarea;
public:
    Student(const char *nume="", int varsta=0, int an=0,const char *specializarea="");
    Student(const Student &s);
    ~Student();
    void setSpecializarea(const char *specializarea);
    Student &operator =(const Student &s);
    friend istream& operator >>(istream& in, Student &s);
    friend ostream& operator <<(ostream& out, const Student &s);
};

Student::Student(const char *nume, int varsta, int an, const char *specializarea): Persoana(nume, varsta) {
    this->an=an;
    this->specializarea=new char[strlen(specializarea)+1];
    strcpy(this->specializarea, specializarea);
}

Student::Student(const Student &s):Persoana(s) {
    this->an=s.an;
    this->specializarea=new char[strlen(s.specializarea)+1];
    strcpy(this->specializarea, s.specializarea);
}
Student::~Student() {
    delete[] specializarea;
}
void Student::setSpecializarea(const char *specializarea) {
    if(strlen(this->specializarea)<strlen(specializarea)) {
        delete []this->specializarea;
        this->specializarea=new char[strlen(specializarea)];
    }
    strcpy(this->specializarea, specializarea);
}
Student& Student::operator =(const Student &s) {
    if(this!=&s) {
        Persoana::operator=(s);//copiaza numele si varsta
        this->an=s.an;
        setSpecializarea(s.specializarea);
    }
    return *this;
}
istream& operator >>(istream& in, Student &s) {
    in>>(Persoana&) s; //citeste pe s ca fiind o persoana adica citeste nume si varsta
    cout<<"An:";
    in>>s.an;
    char temp[100];
    cout<<"Specializarea:";
    in>>temp;
    s.setSpecializarea(temp);
    return in;
}
ostream& operator <<(ostream& out, const Student &s) {
    out<<"----Student----"<<endl;
    out<<"Nume:" << s.nume<<endl;
    out<<"Varsta:" << s.varsta<<endl;
    out<<"An:"<<s.an<<endl;
    out<<"Specializarea:"<<s.specializarea<<endl;
    return out;
}

int main() {
    Student p;
    cin>>p;
    cout<<p;

    Persoana a1("Ana", 19);
    cout<<a1;
    Persoana a2("Maria", 21);
    cout<<a2;
    Persoana a3=a1;
    cout<<a3;
    Student s1("Ana",19, 1, "UMF");
    cout<<s1;
    Student s2("Andrei",20, 2, "Info");
    cout<<s2;
    Student s3;
    s3=s2;
    cout<<s3;
    return 0;
}