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Help using .find_first_not_of to check true or false.

Ziggy8 (3)
It runs well now but my I only have 2 problems...
1.even if I press Hi1234 still shows that i need lowercase,upper and number.
2.doesnt recognize the true for the program to end.

PS...i know there are other methods but our teacher told us to use the find() methods.

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 #include <iostream>
#include <string>

using namespace std;


bool check_password(const string& password);
bool check_input(const string& password, const string& upper, const string& number, const string& lower);

int main()
{


	int length;
	string password;
	string lower , number;
	string upper;

	cout << "Write a password: \n"
		"Must Have at least one Uppercase letter\n"
		"At least one Number\n"
		"Please enter 6 - 10 characters: " << endl;
	
	
	
	
		getline(cin, password);
		length = password.size();




		
			if(check_password(password) == false)
			{
				cout << "Must have 6 - 10 digits. Please re-enter your password." << endl;
				getline(cin, password);
				length = password.size();

			}
			

		
			while (check_input(password, lower, number, upper) != string::npos)
			{
				cout << "Try Again\n" << endl;
					getline(cin, password);
					length = password.size();

				
			while (check_password(password) == false)
				{
					cout << "Must have 6 - 10 digits." << endl;
					getline(cin, password);
					length = password.size();
				}
			
			}
			
			while (check_input(password, lower, number, upper) != string::npos)
				{
					cout << "Good Job";
				}


			system("pause");

}

bool check_password(const string& password)

{
	
	if (password.length() < 6 || password.length() > 10)
			
	{
		return false;			
	}
	

	else
	{
		return true;
	}

}

bool check_input(const string& password,  const string& upper, const string& number, const string& lower)
{
	
	
	 lower == ("abcdefghijklmnopqrstuvwxyz");
	 number == ("0123456789");
  	 upper == ("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
	 
	
	

		 if (password.find_first_not_of(upper) != string::npos)
		 {
			 cout << "Must contain an uppercase letter." << endl;

		 }

		 if (password.find_first_not_of(lower) != string::npos)
		 {
			 cout << "Must contain a lowercase. " << endl;

		 }

		 if (password.find_first_not_of(number) != string::npos)
		 {
			 cout << "Must contain a number. \n" << endl;
			 return true;
		 }
	
	

}
LB (13399)
Your conditions on lines 99, 105, and 111 are backwards.

You are not using return statements correctly.
Ziggy8 (3)
Im only in one month of class , can you tell me how it goess , this confuses me a bit the "true or false talk"
LB (13399)
Boolean logic is a fundamental concept in many fields and it is essential that you understand it. What specifically is confusing to you?
Ziggy8 (3)
No worries I already worked it out , thanks anyway :)
Heres the code so you can see if you want.
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#include <iostream>
#include <string>

using namespace std;


bool check_password(const string& password);


bool check_pass(const string password);
bool check_upper(const string password);
bool check_number(const string password);
bool check_lower(const string password);


int main()
{

	string username;
	int length;
	string password;
	string lower, number;
	string upper;

	cout << "Welcome: User1 \n"
		"What's your Password? \n"
		"Must Have at least one Uppercase letter\n"
		"At least one Number\n"
		"Please enter 6 - 10 characters: " << endl;



	
	getline(cin, password);
	length = password.size();


	check_pass(password);


	while (check_password(password) == false)
	{
		cout << "Must have 6 - 10 digits. Please re-enter your password." << endl;
		getline(cin, password);
		length = password.size();

		check_pass(password);
	}

	

	while (check_upper(password) == false || check_number(password) == false || check_lower(password) == false)
	{

		
		cout << "Try Again\n" << endl;
			getline(cin, password);
			length = password.size();

			check_pass(password);
	
	while (check_password(password) == false)
			{
				cout << "Must have 6 - 10 digits." << endl;
				getline(cin, password);
				length = password.size();
			
				check_pass(password);
			}

	}
		

	system("pause");
	}

	bool check_password(const string& password)

	{

	if (password.length() < 6 || password.length() > 10)

		{
			return false;
		}
	else
		{
			return true;
		}
	}

	
	bool check_upper(const string password)
	{

	if (password.find_first_not_of("abcdefghijklmnopqrstuvwxyz0123456789 ") == string::npos)

		{
			cout << "Must contain an uppercase letter." << endl;
			return false; 
		}
		
		return true;
	}

	bool check_number(const string password)
	{

	if (password.find_first_not_of("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ") == string::npos)

		{
			cout << "Must contain a number." << endl;
			return false;
		}
		
		
			return true;

		
	}

	bool check_lower(const string password)
	{

	if (password.find_first_not_of("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ") == string::npos)

		{
			cout << "Must contain an lowercase letter." << endl;
			return false;
		}
		
		return true;
	}
	
	
	bool check_pass(const string password)

	{

		bool has_number = check_number(password);
		bool has_Upper = check_upper(password);
		bool has_lower = check_lower(password);


		if (has_number == true && has_Upper == true && has_lower == true)

		{ 

			cout << "\nLogged In as User1\n\n";
			return true;

		}

		return false;
	}
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