Password.cpp

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

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
*/
// Implementation E
bool Password::has_mixed_case(string str)
{
  bool found = false;
  for(char c : str){
    if( !found && c >= 'A' && c <= 'Z' ){
      found = true;
    }
    else if( found && c >= 'a' && c <= 'z'){
      return true;
    }
  }
  return false;
}

unsigned int Password::unique_characters(string str)
{
  unsigned int count = 0;
  bool found[256] = {false};
  for(char c : str){
    if( !found[(unsigned char)c] ){
      found[(unsigned char)c] = true;
      count++;
    }
  }
  return count;
}