More info :D

Again, I'd like to share another website I'm working on. I've designed it to post reviews for different hardware and software stuff which I find interesting. Here's a link to my first post! :) Enjoy! Patriot XPorter XT Boost review

Forex trading

Hi everyone!!! Sorry for the lack of posts, I know it looks like this blog was abandoned, but it's not (not completely :) ).

I've been busy with trying out some online Forex trading with some degree of success.
If anyone out there is interested, please make sure to check out this awesome MetaTrader 4 indicator that I wrote (using my full expertise as a software developer):

http://www.intelligentsoftware.info/

I took these algorithms to the next level by using neural networks to build the ultimate indicator which tells you if the price goes up or down.

Good luck and have fun!

How to print a spiral of numbers 1 through N

Printing the numbers 1 through N in a spiral is asked on interviews sometimes and is a interesting puzzle to solve. The reverse process is also simple but I will not write it here.

The code here is quite simple, but it does not print the numbers thorough N in a spiral, instead it prints a matrix with size N in which numbers are arranged into a spiral. Assuming N is given (16 for example), identifying the matrix size is simply of matter of finding sqrt(n). The idea is to print the outer layer and move inward progressively until reaching the most inner layer.

   1:  #define N 4

   2:  int mat[N][N];

   3:   

   4:  void fillSpiral() {

   5:      int start = 0;

   6:      int end = N;

   7:      int k = 0;

   8:      while (end - start >= 1) {

   9:          for (int i = start; i < end; i++) {

  10:              mat[start][i] = k;

  11:              ++k;

  12:          }

  13:          for (int i = start + 1; i < end; i++) {

  14:              mat[i][end - 1] = k;

  15:              ++k;

  16:          }

  17:          for (int i = end - 2; i >= start; i--) {

  18:              mat[end - 1][i] = k;

  19:              ++k;

  20:          }

  21:          for (int i = end - 2; i >= start + 1; i--) {

  22:              mat[i][start] = k;

  23:              ++k;

  24:          }

  25:          ++start;

  26:          --end;

  27:      }

  28:  }

  29:   

  30:   

  31:  int main() {

  32:      memset(mat, 0, sizeof(mat));

  33:      fillSpiral();

  34:      for (int i = 0; i < N; i++) {

  35:          for (int j = 0; j < N; j++) {

  36:              cout << mat[i][j] << "\t";

  37:          }

  38:          cout << endl;

  39:      }

  40:      cout << endl << endl;

  41:      return 0;

  42:  }

And the result is something like this (notice the spiral):

0       1       2       3

11      12      13      4

10      15      14      5

9       8       7       6