Матрица

#include <iostream>

using namespace std;

class Matrica {
private:
    float m[10][10];
    int r;
    int c;
public:
    Matrica() {
        r = 0;
        c = 0;
        for(int i = 0; i < 10; ++i) {
            for(int j = 0; j < 10; ++j)
                m[i][j] = 0;
        }
    }
    Matrica operator +(int const &n) {
        Matrica t;
        t.r = r;
        t.c = c;
        for(int i = 0; i < r; ++i) {
            for(int j = 0; j < c; ++j)
                t.m[i][j] = m[i][j] + n;
        }
        return t;
    }
    Matrica operator -(const Matrica &x) {
        Matrica t;
        t.r = x.r;
        t.c = x.c;
        for(int i = 0; i < x.r; ++i) {
            for(int j = 0; j < x.c; ++j)
                t.m[i][j] = m[i][j] - x.m[i][j];
        }
        return t;
    }
    Matrica operator *(const Matrica &x) {
        Matrica t;
        t.r = x.r;
        t.c = x.c;
        for(int i = 0; i < x.r; ++i) {
            for(int j = 0; j < x.c; ++j) {
                float tmp = 0;
                for(int k = 0; k < x.r; ++k)
                    tmp += m[i][k] * x.m[k][j];
                t.m[i][j] = tmp;
            }
        }
        return t;
    }
    friend istream& operator>>( istream& in, Matrica& x );
    friend ostream& operator<<( ostream& out, Matrica& x );
};
istream& operator>>( istream& in, Matrica& x )
{
    in >> x.r;
    in >> x.c;
    for(int i=0; i<x.r; i++)
        for(int j=0; j<x.c; j++)
            in >> x.m[i][j];
    return in;
}
ostream& operator<<( ostream& out, Matrica& x )
{
    for(int i=0; i<x.r; i++)
    {
        for( int j=0; j<x.c; j++)
            out<<x.m[i][j]<<" ";
        out<<endl;
    }
    return out;
}
int main()
{
    Matrica A,B,C;
    cin>>A>>B>>C;
    Matrica D=B*C;
    Matrica R=A-D+2;
    cout<<R;

}