Read from file char by char in c++

Question

I'm trying to read from a file from the terminal. The first and the second line of the file consist of the row number and column. While other lines consist of matrix character contents. I was able to read the first and second lines and stores their values and accordingly assign matrix size. But I cant figure out how to read the remaining part.

  #include <iostream>
  #include <fstream>

  using namespace std;

int main(int argc, char *argv[])
{
ifstream f;
f.open(argv[1]);

int row, col;


f >> row;
f >> col; 

char matrix[row][col];
char c;
int i = 0, j = 0;


while (!f.eof()) {

    //TODO  
 }

f.close();

return 0;
}

EDIT1: The file contents:

11
11
X XXXXXXXXX
X X       X
X XXXXX X X
X     X X X
XXXXX XXX X 
X X  X    X
X X XX X  X
X X     X X
X XXXXXXX X
X         X
XXXXXXXXXXX

Answer 1

Try this:

#include <iostream>
#include <string>
#include <fstream>
#include <vector>

int main(int argc, char *argv[])
{
    std::vector<std::string> v;
    std::ifstream in(argv[1]);
    std::string line;

    int row, col;
    in >> row >> col;

    while (std::getline(in, line))
    {
        if (!line.empty())
            v.push_back(line);
    }
}

Answer 2

You didn't show the file contents, so I assume this should work :

int i,j;

for( i=0; i < row; ++i)
 for( j=0; j < col; ++j)
   f >> matrix[i][j] ;

No need to check end of file, if file has exactly row*col characters separated by space

As per your updated pose you need to read white space too So try this,

for( i=0; i < row; i++)
 for( j=0; j < col; j++)
    f >> std::noskipws >> matrix[i][j] ; // Don't skip white-space

I haven't tested this but I assume you might have to do some other tweaks (may be increase row to 12).

Also to clear the noskipws flag use f.unsetf(ios_base::skipws);