// Prog: matrix_operations_template.cpp
// Author:

#include <iostream>

// define Matrix type ...


// POST: returns A+B
Matrix operator+ (const Matrix A, const Matrix B)
{
    // ...
}


// POST: returns matrix product A*B
Matrix operator* (const Matrix A, const Matrix B)
{
    // ...
}


// POST: returns scalar multiplication s*A
Matrix operator* (const double s, const Matrix A)
{
    // ...
}


// POST: returns scalar multiplication A*s
Matrix operator* (const Matrix A, const double s)
{
    // ...
}


// PRE: a 2x2-matrix is in is according to the format:  ... (specify your format)
// POST: a 2x2-matrix is extracted from is
std::istream& operator>> (std::istream& is, Matrix& A)
{
    // ...
}


// POST: A is written to os according to the format:  ... (specify your format)
std::ostream& operator<< (std::ostream& os, const Matrix A)
{
    // ...
}


int main ()
{
    // ...
    
    return 0;
}