Here's my code for a Hangman game I'm developing:

#include <iostream>

using namespace std;

const char *const Words[]={"America", "Barrack", "country", "doctors","salamat"};
#define NWORDS (sizeof Words/sizeof (char *))
int main()
{

  const char *toguess=Words[0];
  char guess[15] = "       ";

  int numguesses = 1;
  char ch;
  string str1;
  string str2; //

  string mychars("");

  unsigned wordno=1;

  std::cout << "Welcome to Hangman!\nRaymund is to be executed for a crime he committed.\nTo save him, you need to guess any of the five words provided by the judge.\nYou are given only 15 tries to solve any of the 5 words.\nGoodluck!\n\nNow enter a number to select the word to guess[1.." << NWORDS << "]: ";
  cin >> wordno;
  toguess = Words[wordno-1];

  bool playing = true;

  while (playing)
    {

      cout << "Enter your guess:" ;
      cin >> ch;
      if (0>ch>5)
      {
      cout << "Choose only a number from 1 to 5!" << endl;
      }
      else (1<=ch=<5)
      {
       mychars = mychars + ch;
       cout << "Your wrong guesses so far: " << mychars << endl;
       cout << endl;

      const char *tp ;
      char *gp;
      for (tp=toguess, gp=guess;*tp; tp++, gp++) {
    if(ch == *tp)
      *gp=ch;
      }

      str1 = toguess;
      str2 = guess;

      for(gp=guess; *gp; gp++)
    cout << *gp << " ";
      cout << endl;
      for(int i=1; i <= str1.length();i++)
    cout << "- ";
      cout << endl;


      if ( str1==str2)
    {
      cout << "Conrats! You got it right!" << endl ;
      playing= false;

    }

      else
    {
      numguesses = numguesses + 1;

      if (numguesses>15)
        {

          cout<<endl<<endl
            <<"   +----+     "<<endl
            <<"   |    |     "<<endl
            <<"   |    O     "<<endl
            <<"   |   /|\\   "<<endl
            <<"   |   / \\   "<<endl
            <<"   |You ran out of guesses! "<<endl
            <<"  ============"<<endl<<endl;
          playing=false;
        }
    } // else
    } // else
    } // loop

  cout << " Thanks for playing! " << endl;

  return 0;
}

I want to add something in this part

   mychars = mychars + ch;
   cout << "Your wrong guesses so far: " << mychars << endl;
   cout << endl;

such that I can count the number of tries left by the player. My plan is to count the letters in mychars then store that number in a variable and subtract the variable from 15. I wonder if that's right? Also, is my code generally OK? Thanks for the help!