Password.cpp

#include "Password.h"
#include <string>

#include <iostream>
#include <cctype>

using std::string;

/*
  The function receives a string counts how many times the same character 
  occurs at the beginning of the string, before any other characters (or the
  end of the string). The function is case-sensitive so 'Z' is different than
  'z' and any ASCII characters are allowed.
*/
int Password::count_leading_characters(string phrase){
  int repetition = 1;
  int index = 0;
  while( index < phrase.length()-1 && phrase[index] == phrase[index+1] ){
    repetition++;
    index++;
  }
  return repetition;
}


/*
  receives a string and returns whether it has both at least one upper-case
  letter and at least one lower-case letter
*/
bool Password::has_mixed_case(string pass){

  // base case: (early exit)
  if (pass.length() < 2) return false;

  bool hasLower = false;
  bool hasUpper = false;

  for (char ch : pass) {
      if (std::islower(ch)) hasLower = true;
      if (std::isupper(ch)) hasUpper = true;

      // early exit condition: (true, has mixed case)
      if (hasUpper && hasLower) return true;
  }

  // exit condition: (false, no mixed case)
  return false;
}