Variable length in a Matrix c++

Asked Oct 12 '21 at 13:40

Active Oct 12 '21 at 16:52

Viewed 42 times

I'm using VS 2019. In this code:

using namespace std;
int main()
{
    cout << "Inserisci la dimensione della matrice:";
    int DIM;
    DIM = 2;
    cin >> DIM;
        int v[DIM][DIM];
    return 0;
}

I Don't understand why in:

int v[DIM][DIM];

I've this error:

The expression must have a constant value. It is not possible to use the "DIM" variable value as a constant.

edited Oct 12 '21 at 16:52

asked Oct 12 '21 at 13:40

Davide Borrello

2

Note that the post title must be in English too. – Damien Oct 12 '21 at 13:42
As the error says, `DIM` must be a constant (compile-time) value. – ChrisMM Oct 12 '21 at 13:43
1

If you need a run time sized array, use a `std::vector` or `std::unique_ptr` – NathanOliver Oct 12 '21 at 13:44

Variable length in a Matrix c++

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