Some C++ code

#include <string>
#include <iostream>
using namespace std;

bool validateLength(string);
bool validateLowerCase(string);
bool validateUpperCase(string);
int main()
{

  string input;
  bool validInput = false;
  while(!validInput)
  {
        cout<<"Enter password!"<<endl;
        cin>>input;
        bool validLength = validateLength(input);
        bool validLowerCase = validLength && validateLowerCase(input);
        bool validUpperCase = validLowerCase && validateUpperCase(input);
        validInput = validLength && validLowerCase && validUpperCase;
  }
  cout << "done!";
}

bool validateLength(string input)
{
    if (input.length()< 7)
    {
        cout << "Password must be longer than 7";
        return false;
    }
    return true;
}

bool validateLowerCase(string input)
{
    int position = -1;
    for(char lowerCase='a'; lowerCase < 'z'; lowerCase ++)
    {
        position = input.find(lowerCase);
        if (position > -1)
        {
            return true;
        }
    }
    cout <<"Password must contain lower case";
    return false;
}

bool validateUpperCase(string input)
{
    int position = -1;
    for(char upperCase='A'; upperCase < 'Z'; upperCase ++)
    {
        position = input.find(upperCase);
        if (position > -1)
        {
            return true;
        }
    }
    cout<< "Password must contain upper case";
    return false;
}