CppContainsALetter.cpp

#include <iostream>
#include <map>

int main()
{
  std::string term = "";
  std::map<std::string, bool> missing;
  bool complete = false;
  
  do {
    complete = true;
    missing["upper"] = false;
    missing["lower"] = false;
    missing["number"] = false;
    missing["special"] = false;
  
    std::cout << "Enter a word: ";
    std::getline(std::cin, term);
    
    if (term.size() < 8){
      std::cout << "Your password must be longer than 8 characters" << std::endl;
      complete = false;
      continue;
    }
    
    for(char c : term){
      if (65 <= int(c) and int(c) <= 90){
        missing["upper"] = true;
        
      }
      else if (97 <= int(c) and int(c) <= 122) {
        missing["lower"] = true;
      }
      else if (48 <= int(c) and int(c) <= 57) {
        missing["number"] = true;
      } else {
        missing["special"] = true;
      }
    }
    
    for (auto& kv : missing) {
      if (not kv.second) {
        std::cout << "Your password must contain a " << kv.first << " character!" << std::endl;
        complete = false;
      }
    }
    
  } while(not complete);
  
  std::cout << "Welcome!" << std::endl;
  return 0;
}