lab2_3_Ilya

#include <QtCore/QCoreApplication>
#include <cstdlib>
#include <ctime>
#include <iostream>

using namespace std;

class matrix
{
private:
    int ** mx;
    int h, w;
public:
    matrix (int h = 2, int w = 2);
    matrix (const matrix &);
    ~matrix ();
    matrix operator + (const matrix&);
    matrix operator * (const matrix&);
    matrix operator = (const matrix&);
    friend istream & operator >> ( istream &,const  matrix &);
    friend ostream & operator << ( ostream &,const  matrix &);
    void fillRandom(int scale = 10);
};

matrix :: matrix (int h , int w)
{
    //  first
    this->h = h; this->w = w;
    mx = new int * [h];
    for (int i = 0; i < h; i ++)
        mx [i] = new int [w];
}

matrix :: matrix (const matrix & m)
{
    h = m.h;
    w = m.w;
    mx = new int * [h];
    for (int i = 0; i < h; i ++)
        mx [i] = new int [w];
    for (int i = 0; i < h; i ++)
        for (int j = 0; j < w; j ++)
            mx [i] [j] = m.mx [i] [j];
}

matrix :: ~matrix ()
{
    for(int i = 0; i < h; i ++)
        delete mx [i];
    delete [] mx;
}

matrix matrix :: operator + (const matrix& m2)
{
    matrix m3;
    if (h==m2.h && w==m2.w)
    {
        m3.h = h;
        m3.w = w;
        for (int i = 0; i < h; i ++)
            for (int j = 0; j < w; j ++)
                m3.mx [i] [j] = mx [i] [j] + m2.mx [i] [j];
    }
    return m3;
}

matrix matrix :: operator = (const matrix& m2)//????????????
{
    h = m2.h;
    w = m2.w;
    for (int i = 0; i < h; i ++)
        for (int j = 0; j < w; j ++)
            mx [i] [j] = m2.mx [i] [j];
    return *this;
}

matrix matrix :: operator * (const matrix &m2)
{
    matrix m3;
    int work;
    if (w == m2.h)
    {
        m3.h = h;
        m3.w = m2.w;
        for (int i = 0; i < m3.h; i ++)
            for (int j = 0; j < m3.w; j ++)
            {
                work = 0;
                for (int k = 0; k < w; k ++)
                    work += (mx [i] [k]) * (m2.mx [k] [j]);
                m3.mx [i] [j] = work;
            }
    }
    return m3;
}

istream & operator >> ( istream & cin_,const  matrix & m)
{
    cin_ >> m.h >> m.w;
    for (int i = 0; i < m.h; i ++)
        for (int j = 0; j < m.w; j ++)
            cin_ >> m.mx [i] [j];
    return cin_;
}

ostream & operator << ( ostream & cout_,const  matrix & m)
{
    for (int i = 0; i < m.h; i ++)
    {
        for (int j = 0; j < m.w; j ++)
            cout_ << m.mx [i] [j] << ' ';
        cout_ << endl;
    }
    return cout_;
}
void matrix::fillRandom(int scale){



    for (int i = 0; i < h; i ++){
        srand(time(NULL) + rand()%195);
        for (int j = 0; j < w; j ++)
            mx [i][j] = rand()%(scale);
    }
}

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    matrix a, b, c;
    a.fillRandom();
    b.fillRandom();
    cout << a <<  endl << b << endl;

    c=a+b;
    cout << c << endl ;

    c=a*b;
    cout << c << endl;

    return app.exec();
}