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

// Comment the line below out if you want to read from a real file!
std::istringstream in_file("3 2 5 1 9 5 7 6 3 2 4 2 1 8 6 9");

int main()
{
    std::string file_name = "matrixin.txt";
    
    // Remove the comment of the line below if you want to read from a real file!
    //std::ifstream in_file( file_name );
    if( !in_file )
    {
        std::cerr << "File " << file_name << " couldn't opened!\n";
        return 1;
    }
   
    
    while( true )
    {
        std::vector<int> matrix;
        int height, width; // the dimensions
        
        // read the dimensions from file
        if( !(in_file >> height >> width) )
            break;  // file is at at end (or others happend with)
    
        // I use a one dimensional array, the two-dimensonality will
        // get achieved through arithmetic operations
        
        // read the matrix from file
        for( int i = 0; i < width*height; ++i )
        {
            int tmp;
            in_file >> tmp;
            matrix.push_back( tmp );
        }
        
        // print the matrix
        for( int h = 0; h < height; ++h )
        {
            for( int w = 0; w < width; ++w )
            {
                std::cout << matrix[ w + h*width ] << ' ';
            }
            std::cout << '\n' ;// line break
        }
        std::cout << '\n';
    }
}

#include<stdio.h>
#include<stdlib.h> 

int main()
{
  int rows = 0, cols = 0;
  //set up file reading
  FILE *fptr;

  //opening the file
  fptr = fopen("matrixIn.txt", "r");

  if (!fptr) {
    printf("Error!");
    return -1;
  }
  if (fscanf(fptr, "%d %d", &rows, &cols) != 2)
  {
    printf("Error reading file");
    return 1;
  }
  printf("Rows: %d\tCols: %d", rows, cols);
  return 0;
}