zad-vektori-predavanja

#include <iostream>
#include <vector>
#include <iomanip>

typedef std::vector <std::vector<double>> Matrica;

Matrica Kreiraj_matricu(int br_redova, int br_kolona)
   {
    return Matrica(br_redova, std::vector <double> (br_kolona));
   }

int br_redova (Matrica m)
  {
   return m.size();
  }

int br_kolona (Matrica m)
{
    return m[0].size();
}

Matrica Unesi_matricu (int br_redova, int br_kolona)
{
    auto m(Kreiraj_matricu(br_redova, br_kolona));
    for (int i(0); i<br_redova; i++)
        for (int j(0); j<br_kolona; j++)
        {   std::cout<<"Element ("<<i+1<<","<<j+1<<") : ";
            std::cin>>m[i][j];
        }
        return m;
}

void Ispisi_matricu (Matrica m)
{
    for (int i(0); i<br_redova(m); i++)
        for (int j(0); j<br_kolona(m); j++)
            {
                std::cout<<std::setw(10)<<m[i][j];
                std::cout<<std::endl;
            }
}

bool Mogu_se_sabirati(Matrica m1, Matrica m2)
{
    return  (br_redova(m1)==br_redova(m2)) && (br_kolona(m1)==br_kolona(m2));

}

Matrica Saberi_matrice(Matrica m1, Matrica m2)
{
    auto m3(Kreiraj_matricu(br_redova(m1), br_kolona(m1)));
    for (int i(0); i<br_redova(m1); i++)
        for (int j(0); j<br_kolona(m1); j++)
    {
        m3[i][j]=m1[i][j]+m2[i][j];
    }
    return m3;

}

bool Mogu_se_mnoziti (Matrica m1, Matrica m2)
{
    return br_kolona(m1)==br_redova(m2);
}

Matrica Pomnozi_matrice(Matrica m1, Matrica m2)
{
    auto m3 (Kreiraj_matricu(br_redova(m1), br_kolona(m2)));
    for (int i(0); i<br_redova(m1); i++)
        for (int j(0); j<br_kolona(m2); j++)
    {
        double suma(0);
        for (int k(0); k<br_redova(m2); k++)
            suma+=m1[i][k]+m2[k][j];
        m3[i][j]=suma;
    }
    return m3;
}

int main ()
{
    int m1, n1;
    std::cout<<"Unesi dimenzije matrice A: ";
        std::cin>>m1>>n1;
    std::cout<<"Unesi elemente matrice A: "<<std::endl;
        auto A (Unesi_matricu(m1,n1));
    int m2, n2;
    std::cout<<"Unesi dimenzije matrice B: ";
        std::cin>>m2>>n2;
    std::cout<<"Unesi elemente matrice B: "<<std::endl;
        auto B(Unesi_matricu(m2, n2));

    if (Mogu_se_sabirati(A,B))
        {
            std::cout<<"Matrica A+B: "<<std::endl;
            Ispisi_matricu(Saberi_matrice(A,B));
        }
    else std::cout<<"Matrice nisu saglasne za sabiranje. "<<std::endl;

    if (Mogu_se_mnoziti(A,B))
    {
        std::cout<<"Matrica A*B: "<<std::endl;
        Ispisi_matricu(Pomnozi_matrice(A,B));
    }
    else std::cout<<"Matrice nisu saglasne za mnozenje. "<<std::endl;
    return 0;
}