Read input from file (characters) and store them as a binary array in C++. Input

Question

Read input from file (characters) and store them as a binary array in C++.

Input file will be mixed between characters and numbers, so I cannot read the entire file in as a binary file. ONLY NEED THE CHARACTERS AS BINARY.

File input will be something like this:
2
HELLO
3
232

And as I stated above, i only need the characters (in this case, 'HELLO') read in and stored as binary. I've trying using <bitset> but I will need to modify the binary information later on in the program, so maybe an array or vecotr of chars?

Explanation / Answer

Following steps can be followed:

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <string.h>
#include <cctype>

using namespace std;

bool isNumber(const std::string& s)
{
   std::string::const_iterator it = s.begin();
   while (it != s.end() && std::isdigit(*it)) ++it;
   return !s.empty() && it == s.end();
}

int main()
{
   string line;
   ifstream infile("input.txt");
   ofstream outfile("output.txt", ios::binary|ios::out);//, ios::binary);

   while(getline(infile, line))
   {
       if (isNumber(line) == true)
       {
           line = line + " ";
           outfile.write(line.c_str(), line.length());
       }

   }
   infile.close();
   outfile.close();
   cout << "Integers from input file have been written to output file as binary" << endl;

   return 0;
}

OUTPUT:

$ g++ program.cpp
$ ./a.out
Integers from input file have been written to output file as binary

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