LE CARRÉ MAGIQUE

#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;

int carremaj(int n)
{
  vector<int> v(n*n);
  int i = ((n*n)/2)+n, r = 1;
  v[i] = r++;
  while(r <= n*n) 
  {
    int i2 = (i + (i%n == (n-1) ? +1 : (n+1))) % (n*n);
    if(v[i2] == 0)
        v[i = i2] = r++;
    else
        v[i = (i + 2*n) % (n*n)] = r++;
    }
  for(int a = 0; a < n*n; ++a) {
    setw(5);
    if(a%n == 0) cout << endl;
    cout << v[a] << " ";
  }
  cout << endl;
  return n;
}

int main()
{
  int n;
  cout << "Entrer un nombre N qui doit etre impair : " << endl;
  cin >> n;
  carremaj(n);
  return 0;
}