I have a 2D\_array with size `[4344][20]`, for some reasons I want to transfer between the first 20 rows, then move to the next 20 rows, and then to next next 20 rows... etc. until reach to the last row which is row 4343.

Do I do that correct?

my code:

```
int main()
{
    int tindex = 0;
    for (int l = tindex; l + 20 < 4344; l + 20) {
        for (int u = tindex; u < tindex + 20; ++u) {

            ............
        }
        tindex = tindex + 20;
    }
}

```