if (user_input == 1)
          {
        	  dict.open("dict.txt");
 
        	  cout << "Enter word ";
        	  cin >> word_check;
        	  toLower(word_check);
 
        	  vector<string> lines;
        	  string line;
 
        	  if (dict.is_open()) // if the dictionary is open
        	  {
 
        		  while (getline(dict,line))
        		  {
            		  lines.push_back(line);
        		  }
 
        		  if (binarySearch(lines, lines.size(), word_check) != -1)
        		  {
        				  cout << word_check << " is in dictionary" << endl;
        		  }
        		  else
        		  {
        				  cout << word_check << " is not in dictionary" << endl;
        		  }
 
        		  cout << lines.size() << endl; // testing to see if vector has stored all words
        	  }
          }

ifstream inputFile("toBeOrNot2Be.doc");
inputFile.seekg(0,std::ios_base::beg);

dict.close( );
dict.clear( );

read the data file, storing to vector of strings
loop
    ask user for input word to find
    search for word

Crossword Helper 
 
 1 : Check if word is in dictionary 
 2 : Find words in dictionary which match pattern 
 3 : Quit 
 
2 
Enter word pattern with ? for missing letters 
 
y??ht?w????
 
yachtswoman