#include <iostream>

//struct holding the users date of birth
struct UserBirthday {
    int month;
    int day;
    int year;
};

// function that loops to print numbers 1-100
void Print100() {
    for (int i = 0; i <= 100; ++i) {
        std::cout << i << std::endl;
    }
}
//function to recieve user birth day/month/year and return a struct
UserBirthday InputBday() {
    UserBirthday bday;
    std::cout << "enter your birth day: ";
    std::cin >> bday.day;
    std::cout << "enter your birth month: ";
    std::cin >> bday.month;
    std::cout << "enter your birth year: ";
    std::cin >> bday.year;
    return bday;
}
// basic fibonacci sequence function
void fibonacci(size_t n) {
    int a = 0, b = 1, c;
    std::cout << "fibonacci sequence elements up to term number: " << n << std::endl;
    for (size_t i = 0; i < n; ++i) {
        std::cout << a << " ";
        c = a + b;
        a = b;
        b = c;
    }
    std::cout << std::endl;
}

int main() {
    //loop to display menu and process user input while keeping them in menu until they choose exit
    char userChoice;
    do {
        //manu options
        std::cout << "options:" << std::endl;
        std::cout << "a: print100" << std::endl;
        std::cout << "b: input personal information" << std::endl;
        std::cout << "c: print fibonacci" << std::endl;
        std::cout << "d: exit" << std::endl;
        std::cout << "choose: a, b, c, or d: ";
        std::cin >> userChoice;

        // switch to give the user the right output for their aselection, added case insensitivity
        switch (userChoice) {
        case 'A':
        case 'a':
            Print100();
            break;
        case 'B':
        case 'b': {
            UserBirthday userBday = InputBday();
            std::cout << "your birthday is: " << userBday.month << "/" << userBday.day << "/" << userBday.year << std::endl;
            break;
        }
        case 'C':
        case 'c': {
            size_t n;
            std::cout << "enter how many fibonacci terms: ";
            std::cin >> n;
            fibonacci(n);
            break;
        }
        case 'D':
        case 'd':
            std::cout << std::endl << "exiting, goodbye" << std::endl << std::endl;
            break;
        default:
            std::cout << std::endl << "invalid input" << std::endl << std::endl;
            break;
        }
    } while (userChoice != 'D' && userChoice != 'd');

    return 0;
}