### Define a class named "Matrix"

```
#include <iostream>
using namespace std;
class Matrix
{
private:
int numbers[3][3];
public:
void setNumbers(int n[][3]);
void getNumbers();
friend Matrix operator++(Matrix);
};
```

###
Implement `void setNumbers(int n[][3])`

```
void Matrix::setNumbers(int n[][3])
{
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
numbers[i][j] = n[i][j];
}
}
}
```

###
Implement `void getNumbers()`

```
void Matrix::getNumbers()
{
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
cout << numbers[i][j] << "\t";
}
cout << endl;
}
cout << endl;
}
```

###
Implement `Matrix operator++(Matrix n)`

```
Matrix operator++(Matrix n)
{
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
n.numbers[i][j] = ++(n.numbers[i][j]);
}
}
return n;
}
```

###
Implement `int main()`

```
int main()
{
Matrix matrix;
int numbers[3][3] = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9},
};
matrix.setNumbers(numbers);
matrix.getNumbers();
matrix = ++matrix;
matrix.getNumbers();
return 0;
}
```

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## Discussion (1)

Couldn't you do: