Matrix

#include<iostream>
#include <cstring>
using namespace std;
class Matrix
{
    protected:
    float matrix[10][10];
    int rows;
    int columns;
 /** void copy(const Matrix &m)
    {
        this->rows=m.rows;
        this->columns=m.columns;
        for(int i = 0 ; i < rows ; i ++)
        {
            for(int j = 0 ; j < columns ; j ++)
            {
            this->matrix[i][j]=m.matrix[i][j];
            }
        }
    }
    **/
    public:
    Matrix(){}
    Matrix(int rows , int columns)
    {
        this->rows=rows;
        this->columns=columns;
        for(int i = 0 ; i < rows ; i ++)
        {
        for(int j = 0 ; j < columns ; j ++)
         {
            this->matrix[i][j]=0;

            }
        }
    }
   // Matrix (const Matrix &s){copy(s);}


    Matrix &operator +(int s)
    {
       for(int i = 0 ; i < rows ; i ++)
        {
        for(int j = 0 ; j < columns ; j ++)
         {
            matrix[i][j]+=s;
            }
        }
        return *this;
    }
    Matrix &operator-(Matrix &s)
    {
       for(int i = 0 ; i < rows ; i ++)
        {
        for(int j = 0 ; j < columns ; j ++)
         {
            this->matrix[i][j]-=s.matrix[i][j];
            }
        }
        return *this;
    }
    Matrix operator*(Matrix &s)
    {
       Matrix  newMatrix(this->rows,this->columns);

       for(int i = 0 ; i < rows ; i ++)
        {
        for(int j = 0 ; j < columns ; j ++)

         {
            for(int t = 0 ; t < columns ; t ++){

           newMatrix.matrix[i][j]+=this->matrix[i][t]*s.matrix[t][j];
            }

            }
        }
        return newMatrix;
    }
    friend ostream &operator <<(ostream &out ,const Matrix &s)
    {
         for(int i = 0 ; i < s.rows ; i ++)
        {
        for(int j = 0 ; j < s.columns ; j ++)

         {
            out<<s.matrix[i][j]<<" ";


    }
             out<<endl;
}
        return out;
    }
    friend istream &operator >>(istream &in , Matrix &s)
    {
    in>>s.rows>>s.columns;
         for(int i = 0 ; i < s.rows ; i ++)
        {
        for(int j = 0 ; j < s.columns ; j ++)

         {
            in>>s.matrix[i][j];
      }
   }
    return in ;
    }

};
int main() {
    Matrix A,B,C;
    cin >> A >> B >> C;
    Matrix D = B * C;
    Matrix R = A - D + 2;
    cout << R;
}