How to properly parse a .pgm file in C++?

Question

C++ / C#

There is a task - to create an empty file with a .pgm image (just a white background) and draw a black line with arbitrary coordinates. It must be a P5 file containing bits, not just numbers. The task was implemented using the P2 format. How to handle file with P5 extension? And is it possible to use streams in the same way? For some reason, the teacher strongly suggests using fprintf. Here is the code:

#include "stdafx.h"

#include <iostream> 

#include <iomanip>

#include <fstream> 

#include <sstream>

using namespace std;

void drawLine(int** array, int x1, int y1, int x2, int y2) {
  const int deltaX = abs(x2 - x1);
  const int deltaY = abs(y2 - y1);
  const int signX = x1 < x2 ? 1 : -1;
  const int signY = y1 < y2 ? 1 : -1;
  //
  int error = deltaX - deltaY;
  //
  array[x2][y2] = 0;
  
  while (x1 != x2 || y1 != y2)
  {
    array[x1][y1] = 0;
    const int error2 = error * 2;
    //
    if (error2 > -deltaY)
    {
      error -= deltaY;
      x1 += signX;
    }
    if (error2 < deltaX)
    {
      error += deltaX;
      y1 += signY;
    }
  }

}


int main(void)
{
  ofstream fout;
  
  fout.open("E:\\line.pgm");

  fout.write("", 0);

  fout << "P2" << "\n" ;

  int numcols, numrows, x1, x2, y1, y2;

  cout << "Enter rows and columns number: ";

  cin >> numrows >> numcols;

  cout << "Enter coords x1 and y1: ";

  cin >> x1 >> y1;

  cout << "Enter coords x2 and y2: ";

  cin >> x2 >> y2;

  fout << numrows << " " << numcols << "\n";

  fout << 255 << "\n";

  int** array = new int*[numrows];

  for (int count = 0; count < numrows; count++)

    array[count] = new int[numcols];

  for (int i = 0; i < numrows; ++i) {

    for (int j = 0; j < numcols; ++j) {
       array[i][j] = 255;
    }

  }

  drawLine(array, x1, y1, x2, y2);

  for (int i = 0; i < numrows; ++i) {

    for (int j = 0; j < numcols; ++j) {
      fout << array[i][j] << " ";
    }

  }

  fout.close();

}

This is the output file as a result of work:

P2
100 100
255
255 255 0 0 0 0 0 0 0 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 25555 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255

and so on.
P5 looks like this:

P5
# created by 'xv marcie_bw.tif'
#
#
640 480
255
'†tgbaaaaaaaccbbbaabbdeimqruz~…Њ”њЎ¦ЁЁ¤ ћќќ ¦“Їіґµґіі°Ї®“¦џ—Ћ~qgba^]]_bgmqx{}~Ѓѓ€' Є“Јљ•љџЎќќ—'€|њssy†— “ЋЃnfjmlpruursx‰”ћ¤Ё©«Є©¤џ•Џ‹‹‰…ЃЃЃѓ††‚ЃЂ~|vroigfgggeegimy‡Џ•ќЎў¤ўЈ¤¦¦¤Ўqegioqz™'‰‚{wwwwxxyyyqwqs{wwwwxxyyyqwqs{ “ћ©±ё”»ѕАїїѕјAZHYNONNLZHAѕSS»№·іЇЄўђ€‚ЃЂЂЃѓ…ѓѓ††…ѓ††ѓ‚}}~~~~~}|zz|ѓ'ќ§¬«Є©ЁЈ њ–'ЏЊђ– ™™™љ”ЏЉwtu{‚‰Ќ'–љќќћќћџЎЈ“¶AIMSFFUTTUTRONOPNONLYZBSј№¶·є№¶¶i®ЇЇЇi±°

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