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
*/
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;
}

/* Receives a string and returns a count of 
how many case-sensitive unique characters there are. 
If there are duplicate instances of the same character 
it should only count as a single character. 
Even if characters look similar, 
as long as they have distinct ASCII values, 
they should qualify as unique characters. */

unsigned int Password::unique_characters(string str)
{
    if (str.size() == 0) {
        return 0;
    }

    char used[256];  
    int usedCount = 0;

    for (int i = 0; i < str.size(); i++) {
        char c = str[i];
        bool found = false;

        for (int j = 0; j < usedCount; j++) {
            if (used[j] == c) {
                found = true;
                break;
            }
        }
        if (!found) {
            used[usedCount] = c;
            usedCount++;
        }
    }

    return usedCount;
}