Displays the diagonal elements of a square matrix
What will be an ideal response?
```
void Matrix :: showDiagonal () const
{
if (rows == cols)
for (int i = 0; i < rows; ++i)
cout << setw(5) << i + 1 << setw(5) << mat[i][i] << endl;
else
cout << "Error -- Not a square matrix!!!" << endl << endl;
}
```
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