title: trouble with creating two dimensional array from file
body: <p>I have some troubles with parsing matrix file. It looks sth like this:</p>
  
  <pre><code>#  Matrix made by matblas from blosum62.iij 
  #  * column uses minimum score 
  #  BLOSUM Clustered Scoring Matrix in 1/2 Bit Units 
  #  Blocks Database = /data/blocks_5.0/blocks.dat 
  #  Cluster Percentage: &gt;= 62 
  #  Entropy =  0.6979, Expected =  -0.5209 
    A  R  N  D  C  Q  E  G  H  I  L  K  M  F  P  S  T  W  Y  V  B  Z  X  * 
  A  4 -1 -2 -2  0 -1 -1  0 -2 -1 -1 -1 -1 -2 -1  1  0 -3 -2  0 -2 -1  0 -4 
  R -1  5  0 -2 -3  1  0 -2  0 -3 -2  2 -1 -3 -2 -1 -1 -3 -2 -3 -1  0 -1 -4 
  N -2  0  6  1 -3  0  0  0  1 -3 -3  0 -2 -3 -2  1  0 -4 -2 -3  3  0 -1 -4 
  D -2 -2  1  6 -3  0  2 -1 -1 -3 -4 -1 -3 -3 -1  0 -1 -4 -3 -3  4  1 -1 -4 
  C  0 -3 -3 -3  9 -3 -4 -3 -3 -1 -1 -3 -1 -2 -3 -1 -1 -2 -2 -1 -3 -3 -2 -4 
  Q -1  1  0  0 -3  5  2 -2  0 -3 -2  1  0 -3 -1  0 -1 -2 -1 -2  0  3 -1 -4 
  E -1  0  0  2 -4  2  5 -2  0 -3 -3  1 -2 -3 -1  0 -1 -3 -2 -2  1  4 -1 -4 
  G  0 -2  0 -1 -3 -2 -2  6 -2 -4 -4 -2 -3 -3 -2  0 -2 -2 -3 -3 -1 -2 -1 -4 
  H -2  0  1 -1 -3  0  0 -2  8 -3 -3 -1 -2 -1 -2 -1 -2 -2  2 -3  0  0 -1 -4 
  I -1 -3 -3 -3 -1 -3 -3 -4 -3  4  2 -3  1  0 -3 -2 -1 -3 -1  3 -3 -3 -1 -4 
  L -1 -2 -3 -4 -1 -2 -3 -4 -3  2  4 -2  2  0 -3 -2 -1 -2 -1  1 -4 -3 -1 -4 
  K -1  2  0 -1 -3  1  1 -2 -1 -3 -2  5 -1 -3 -1  0 -1 -3 -2 -2  0  1 -1 -4 
  M -1 -1 -2 -3 -1  0 -2 -3 -2  1  2 -1  5  0 -2 -1 -1 -1 -1  1 -3 -1 -1 -4 
  F -2 -3 -3 -3 -2 -3 -3 -3 -1  0  0 -3  0  6 -4 -2 -2  1  3 -1 -3 -3 -1 -4 
  P -1 -2 -2 -1 -3 -1 -1 -2 -2 -3 -3 -1 -2 -4  7 -1 -1 -4 -3 -2 -2 -1 -2 -4 
  S  1 -1  1  0 -1  0  0  0 -1 -2 -2  0 -1 -2 -1  4  1 -3 -2 -2  0  0  0 -4 
  T  0 -1  0 -1 -1 -1 -1 -2 -2 -1 -1 -1 -1 -2 -1  1  5 -2 -2  0 -1 -1  0 -4 
  W -3 -3 -4 -4 -2 -2 -3 -2 -2 -3 -2 -3 -1  1 -4 -3 -2 11  2 -3 -4 -3 -2 -4 
  Y -2 -2 -2 -3 -2 -1 -2 -3  2 -1 -1 -2 -1  3 -3 -2 -2  2  7 -1 -3 -2 -1 -4 
  V  0 -3 -3 -3 -1 -2 -2 -3 -3  3  1 -2  1 -1 -2 -2  0 -3 -1  4 -3 -2 -1 -4 
  B -2 -1  3  4 -3  0  1 -1  0 -3 -4  0 -3 -3 -2  0 -1 -4 -3 -3  4  1 -1 -4 
  Z -1  0  0  1 -3  3  4 -2  0 -3 -3  1 -1 -3 -1  0 -1 -3 -2 -2  1  4 -1 -4 
  X  0 -1 -1 -1 -2 -1 -1 -1 -1 -1 -1 -1 -1 -1 -2  0  0 -2 -1 -1 -1 -1 -1 -4 
  * -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4  1
  </code></pre>
  
  <p>It is a part of bigger program, but first I want to check it separately before putting it into a class. So my code looks like this:</p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;fstream&gt;
  #include &lt;string&gt;
  
  using namespace std;
  
  char readfile(char * file)
  {
      int lines, cols;
      char matrix[30][30];
      ifstream ifs(file, ios::in);
      ifs.precision(2);
      ifs.setf(ios::fixed, ios::showpoint);
      ifs &gt;&gt; matrix[lines][cols];
      while(!ifs.eof())
      {
          string linijka;
          getline(ifs, linijka);
          if (linijka[0] != '#')
          {
              for (lines = 0; lines &lt; 30; lines++)
              {
                  for (cols = 0; cols &lt; 30; cols++)
                  {
                      return matrix[lines][cols];
                  }
              }
          }
      } 
  
      ifs.close();
  }
  
  int main(int argc, char * argv[1])
  {
      cout &lt;&lt; "Matrix:\n" &lt;&lt; readfile(argv[1]) &lt;&lt; endl;
      return 0;
  }
  </code></pre>
  
  <p>Everything is compiled without errors. Unfortuntely matrix is empty. After executing it I receive sth like that:</p>
  
  <pre><code>mateusz@viking:$ ./matpars submat/BLOSUM62.txt 
  Matrix:
  </code></pre>
  
  <p>I need it to get mark from cell e. g. [T][G].</p>
  
  <p>Any ideas? I'll be very thankfully. ;-)</p>