#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define N_KEYS 12
#define KEY_MAX_WIDTH 20
#define FAILS_ALLOWED 7


char possiblekeys [N_KEYS][KEY_MAX_WIDTH] = {
    "mushroom", "pineapple", "neighborhood", "citizen",
    "programming", "darkness", "fundamental", "encyclopedia",
    "businessman", "restaurant", "observatory", "civilization"
};


char key [KEY_MAX_WIDTH];


char outstring [KEY_MAX_WIDTH];

int CheckLetter (char letter);

main ()
{
  using namespace std;
  char input;
  int valid;
  int fails = FAILS_ALLOWED;
  unsigned int discovered = 0;
  unsigned int n;


  srand ( time (NULL) );
  int value = rand()%N_KEYS;
  strcpy (key,possiblekeys[value]);


  for (n=0; n<strlen(key); n++) outstring[n]='-';
  outstring[n]='\0';

  do {

    cout << "\nDiscover the secret key: " << outstring << "\n";
    cout << "Enter a letter (You may fail " << fails << " times): ";
    cin >> input; cin.ignore (100,'\n');


    valid = CheckLetter (input);


    if (valid!=0) discovered+=valid;
    else fails--;

  } while (discovered < strlen(key) && fails>0);



  if (discovered == strlen(key)) cout << "CORRECT! ";

  cout<< "Key was '" << key <<"'.\n";
  return 0;
}


int CheckLetter (char letter)
{
    unsigned int n;
    int found=0;
    for (n=0; n<strlen(key); n++)
        if (key[n]==letter && outstring[n]=='-')
        {
            found++;
            outstring[n]=key[n];
        }
    return found;
}