Matrice

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

class Matrice{
    private:
        int n;
        int m;
        float *p;
    public:
        Matrice(int n, int m);
        Matrice(const Matrice &a);
        ~Matrice();
        void citire();
        void afisare();
        void setLiniiColoane(int n, int m);
        void setElement(int i, int j, float val);//seteaza elem a[i][j] cu valoarea indicata
        int getLinii();
        int getColoane();
        float getElement(int i, int j) const;
        friend Matrice operator*(Matrice a, Matrice b);
        float norma();
};

Matrice::Matrice(int n, int m){
    int i,j;
    this->n = n;
    this->m = m;
    this->p = new float[n*m];
    for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            this->p[i*m+j]=0;
        }
    }
     cout<<"Apel constructor cu parametri"<<endl;
}

Matrice::Matrice(const Matrice &a){
    int i,j;
    this->n = a.n;
    this->m = a.m;
    this->p = new float[a.n*a.m];
    for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            this->p[i*m+j]= a.p[i*m+j];
        }
    }
     cout<<"Apel constructor copiere"<<endl;
}

Matrice::~Matrice(){
    if(p!=0)
        delete p;
 cout<<"Apel destructor "<<endl;
}
void Matrice::citire(){
    int i,j;
    cout<<"Dati elementele"<<endl;
    for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            cout<<"elementul ["<<i<<"]["<<j<<"]= ";
            cin>>p[i*m+j];
        }
    }
    cout<<endl;
}

void Matrice::afisare(){
    int i,j;
     for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            cout<<p[i*m+j]<<"  ";
        }
        cout<<endl;
    }
}
void Matrice:: setLiniiColoane(int n, int m){
    if((this->n)*(this->m)< n*m){
        delete p;
        p= new float(n*m);
    }
    this->n = n;
    this->m = m;
}
void Matrice::setElement(int i, int j, float val){//schimbam valorile elementelor de pe pozitia [i][j]
            this->p[i*m+j]=val;
}

int Matrice::getLinii(){
    return n;
}
int Matrice::getColoane(){
    return m;
}

float Matrice::getElement(int i, int j) const{
    return p[i*m+j];
}

Matrice produs(Matrice &a, Matrice &b){
    int i,j,k;
    Matrice c(a.getLinii(),b.getColoane());
    for(i=0; i<a.getLinii(); i++){
        for(j=0; j<b.getColoane(); j++){
                float suma=0;
            for(k=0; k<b.getLinii(); k++){
                suma+=a.getElement(i,k)*b.getElement(k,j);
            }
            c.setElement(i,j,suma);
        }
    }
    return c;
}
Matrice operator*(Matrice a,Matrice b){
    int i,j,k;
    Matrice c(a.getLinii(),b.getColoane());
    for(i=0; i<a.getLinii(); i++){
        for(j=0; j<b.getColoane(); j++){
                float suma=0;
            for(k=0; k<b.getLinii(); k++){
                suma+=a.getElement(i,k)*b.getElement(k,j);
            }
            c.setElement(i,j,suma);
        }
    }
    return c;
}

int main(){
    int n=2,m=3,p=2;
    Matrice a(n,m);
    cout<<"elem matricii a"<<endl;
    a.citire();
    a.afisare();
    cout<<"-----------------------"<<endl;
    //Matrice b = a;//apeleaza const de copiere
    Matrice b(m,p);
    cout<<"elem matricii b"<<endl;
    b.citire();
    b.afisare();
    cout<<"-----------------------"<<endl;
    Matrice c = produs(a,b);
    cout<<"elem matricii produs"<<endl;
    c.afisare();
    cout<<"-----------------------"<<endl;
    Matrice d = a*b;
    cout<<"elem matricii produs"<<endl;
    d.afisare();

return 0;
}