#include <iostream>
#include <vector>

using namespace std;

// recursively display and remove the first integers of a vector
void recursive(vector<int> &arr) {
	//note: the pointer *arr.begin() == arr[0]
	//base case with a vector of 1 int
	if (arr.size() == 1) {
		cout << *arr.begin() << endl;
		//vector of 2 or more int
	} else {
		cout << *arr.begin() << endl;
		//remove first element and recurse
		arr.erase(arr.begin());
		recursive(arr);
	}
}

int main() {
	//While guessing game
	srand(time(nullptr));
	const int randomNumber = rand() % 10 + 1;
	int guess = 0;
	int guesses = 0;
	cout << "Guess a number between 1 and 10: " << endl;
	while (guess != randomNumber && guesses < 4) {
		cout << "You have " << 4 - guesses << " guesses left!" << endl;
		cin >> guess;
		guesses++;
		if (guess < randomNumber) {
			cout << "Too low!" << endl;
		} else if (guess > randomNumber) {
			cout << "Too high!" << endl;
		} else {
			cout << "Congratulations! You guessed the number." << endl;
		}
	}

	//wait for input
	system("pause");

	//Do-While-Free-Trial
	char card = '-';
	do {
		if (card == '-') {
			cout << "Thank you for activating your free Netflix trial." << endl;
		}
		cout << "One month of Netflix service used." << endl;
		cout << "Want to pay for another month? y or n" << endl;
		cin >> card;
	} while (card == 'y');
	cout << "No more Netflix for you!" << endl << endl;

	//windows-specific pause
	system("pause");
	cout << "Here's a demonstration of the same counting loop using 7 different loop styles:" << endl;
	system("pause");

	cout << "While loop with manual iteration" << endl;
	//WHILE loop
	int i = 0;
	while (i < 5) {
		cout << i << endl;
		i++;
	}

	system("pause");

	//DO-WHILE loop
	cout << endl << "Using Do-While Loop and manual iteration" << endl;
	int j = 0;
	do {
		cout << j << endl;
		j++;
	} while (j < 5);

	system("pause");

	//FOR loop
	cout << endl << "Using For Loop" << endl;
	for (int k = 0; k < 5; k++) {
		cout << k << endl;
	}

	//for use in recursion and for-each loop
	vector<int> numbers = {0, 1, 2, 3, 4};

	system("pause");

	//FOREACH loop
	cout << endl << "Using For-Each Loop and a vector" << endl;
	//int numbers[] = {0, 1, 2, 3, 4};
	for (const int number: numbers) {
		cout << number << endl;
	}

	system("pause");

	//RECURSIVE function call
	cout << endl << "Using Recursion through a vector" << endl;
	recursive(numbers);

	system("pause");

	//GOTO loop in Do-While style
	cout << endl << "Using post-test Goto Loop with manual iteration" << endl;
	int l = 0;
doloop:
	cout << l << endl;
	l++;
	if (l < 5) {
		goto doloop;
	}

	system("pause");

	//GOTO loop in While style
	cout << endl << "Using post-test Goto Loop with manual iteration" << endl;
	int m = 0;
whileloop:
	if (m < 5) {
		cout << m << endl;
		m++;
		goto whileloop;
	}

	system("pause");

}