Manipulating 2d C++ arrays in a custom library - getting the number of rows? -

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I am used for Java but learning C ++ and as an experiment I have to create a library Trying to file in a 2D array with the CSV user defined import specs, print the array in the console, and then type the array into a different file.

I create the array of rows (y-axis), print the array, and write the array while loop through 2d array. I have found the value of X-axis, and I'm negligible with it: 

  int y = sizeof (arr) / sizeof (arr [0]);   
 Try to get it when I tested the code in a compiled CPP main, but now I got the correct number of rows correctly, but now I connected the function to one Is taken to the library which is assigning it Y to 0!  
 Why the difference, and how can I solve it? In the example below I am testing a matrix with 6 fields and 4 records, so I'm looking at 4 as the assigned value of 4.  
 Since I have narrowed the problem to this variable, here it is one (hopefully) how I am getting the SSCCE.  
  Header file:   
  #ifndef csv_io_h # defines CSV_IO_H # and includes; String & gt; using namespace std; Class csv_io {public: static zero csv_to_dbl_arr (string, double arr [] [6], four, four); Static zero print_dbl_arr (double arr [] [6]); }; #endif   
  Library included:   
  #include "csv_io.h" #include & lt; Stdlib.h & gt; # Include & lt; Iostream & gt; # Include & lt; Fstream & gt; # Include & lt; Sstream & gt; # Include & lt; Iomanip & gt; using namespace std; Zero csv_io :: csv_to_dbl_arr (string INF, double ARR [] [6], four dlm, four sep) {ifstream ifs; String line, call, well; Int i = 0; Int j = 0; Ifs.open (inf.c_str ()); If (ifs.is_open ()) {while (ifs.good ()) {getline (ifs, line, sep); Stringstream call (line); While (col.good ()) {getline (col, val, dlm); Arr [i] [j] = etf (val.c_str ()); J ++; } J = 0; I ++; }} Ifs.close (); } Zero csv_io :: print_dbl_arr (double arr [] [6]) {int x = sizeof (arr [0]) / size (double); Int y = sizeof (arr) / sizeof (ARE [0]); Cout & lt; & Lt; "X:" & lt; & Lt; X & LT; & Lt; Andal & lt; & Lt; "Y:" & lt; & Lt; Y & lt; & Lt; Endl; }   
  Main.cpp :  
  #include "csv_io.h" #include "csv_io.cpp" #include & Lt; Stdlib.h & gt; using namespace std; Int main () {double d_arr [4] [6]; String inf = "file_i.txt"; Four in_dlm = ','; Four in_sep = '\ n'; Csv_io :: csv_to_dbl_arr (inf, d_arr, in_dlm, in_sep); Csv_io :: print_dbl_arr (d_arr); Return 0; }   
  file_i.txt:   
  1,1,1,1,1,1,2,2,2, 2,2,2,3,3,3,3,4,4,4,4,4,4   
 I know that I have a counter & amp; Track the number of rows in Csv_to_dbl_arr but I have to express that I am using for Wi, so I can use it without declaring it mainly when I fly it.  
 
 
 
  zero print_dbl_arr (double arr [] [6])  is equal to  void print_dbl_arr (double (* ARM) [6])   
 like  
     
  •   sizeof (arr)  an indicator Size  
  •   sizeof (arr [0])  size is  double (& amp;) [6]  hence  6 * size double .   
     You can use the array from templates and references to get the shape as the following:  
      template & lt; Std :: size_t N, std :: size_t M & gt; Zero print_dbl_arr (double (& amp; ar) [n] [m]); Using   
      std :: vector  /  std :: array  is more intuitive.

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