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

//A function to print a cool banner.
//void functions do stuff, they don't return anything.
void printBanner()
{
	cout << "***************************" << endl;
	cout << "* Welcome to the class!!! *" << endl;
	cout << "***************************" << endl;
	cout << endl;
	cout << endl;
}

//Functions can take parameters as input
void printPersonalBanner(string name)
{
	cout << "******************************" << endl;
	cout << "* Hi " << name << "***********" << endl;
	cout << "* This is your personalized banner. *" << endl;
	cout << "* Wow, " << name << " is a really cool name *" << endl;
}

//Functions can take more than one input
void birthdayGreeting(string name, int age)
{
	cout << "Happy birthday " << name << "!" << endl;
	cout << "You are " << age << " years old!" << endl;

	if (age > 60)
		cout << "Ok boomer!" << endl;
	else if (age < 25)
		cout << "Ok Zoomer!" << endl;
	else
		cout << "Ok normal aged person." << endl;
}

//functions can return values.
//This function computes the product of x and y
//and returns that product
double product(double x, double y)
{

	return x * y;

//	double answer;
//	answer = x * y;

//	return answer;
}

//Challenge: return the value of n!
int factorial(int n)
{

}

int main()
{
	printBanner();
	printBanner();
	printBanner();

	//Now, let's make a cooler banner that says someone's name on it

	//Functions can take a parameter as input
	printPersonalBanner("Amanda");
	printPersonalBanner("Johnson");
	printPersonalBanner("Bruno");

	//Let's make a birthday banner
	string someName;
	int someAge;
	cout << "Hey, what's your name and age? " << endl;
	cin >> someName;
	cin >> someAge;

	birthdayGreeting(someName, someAge);
	birthdayGreeting("Perseus", 17);
	birthdayGreeting("Gerarld", 70);

	//Function can have return values
	double a = 5.4;
	double b = 7.3;
	double answer;

	answer = product(a, b);
	cout << "the product of " << a << " and " << b << " is " << answer << endl;
	cout << "and product of 35 times 71 is " << product(35, 71) << endl;

	//Challenge: Let's solve the quiz
	cout << "Enter a number: " << endl;
	int n;
	cin >> n;

	cout << "Factorial of your number is: " << factorial(n) << endl;

	return 0;
}