Re: newbie in cpp

toylas wrote:


What were these errors? It may help us to help you.


Reading is easy:

std::size_t size = 0;
std::cin >> size;

But using that size is less easy with arrays. In C++, the size of an
array must be a compile-time constant, which is definitely not the case
now. You have two solutions: use dynamically allocated arrays:

int** matrix;
matrix = new int*[size];

for (std::size_t i=0; i<size; ++i)
  matrix[i] = new int[size];

// .. and then

for (std::size_t i=0; i<size; ++i)
  delete[] matrix[i];

delete[] matrix;

which is a pain, you'll agree. The other solution is using standard
containers:

# include <vector>
# include <cstddef>

int main()
{
  typedef std::vector<int> row;
  typedef std::vector<row> matrix;
  matrix m;

  std::size_t size = 10; // you may ask the user for a size here

  for (std::size_t i=0; i<size; ++i)
  {
    row r;
    for (std::size_t j=0; j<size; ++j)
    {
      r.push_back(j);
    }

    m.push_back(r);
  }
}

This should get you started.

Jonathan