drawing from topleft corner

#include <cstdio>
#include <iostream>
#include <cmath>

using namespace std;

int main() {
  while (1) {
    int dimension = 1;
    cin >> dimension;

    if (dimension == 0) break;

    int f[dimension][dimension];

    int topleft = 0;
    for (topleft = 0; topleft < dimension; topleft++) {
      int xi = topleft;
      int yi = topleft;

      int value = pow(pow(2, topleft), 2);
      f[xi][yi] = value;

      for (int x = xi + 1; x < dimension; x++) {
        f[x][yi] = value * 2;
        value *= 2;
      }

      value = pow(pow(2, topleft), 2);
      for (int y = yi + 1; y < dimension; y++) {
        f[xi][y] = value * 2;
        value *= 2;
      }
    }

    for (int i = 0; i < dimension; i++) {
      for (int j = 0; j < dimension; j++) {
        printf("%d ", f[i][j]);
      }
      cout << "\n";
    }
    cout << "\n";
  }

  return 0;
}