// A fixed size raw array matrix (that is, a 2D raw array). #include <iostream> #include <iomanip> using namespace std; auto main() -> int { int const n_rows = 3; int const n_cols = 7; int const m[n_rows][n_cols] = // A raw array matrix. { { 1, 2, 3, 4, 5, 6, 7 }, { 8, 9, 10, 11, 12, 13, 14 }, { 15, 16, 17, 18, 19, 20, 21 } }; for( int y = 0; y < n_rows; ++y ) { for( int x = 0; x < n_cols; ++x ) { cout << setw( 4 ) << m[y][x]; // Note: do NOT use m[y,x]! } cout << '\n'; } }