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

//Print given phrase n times
void annoying(string s, int n)
{
	for (int i = 0; i < n; i++)
	{
		cout << s << endl;
	}
}

//Compute and return take home pay.
//Not anything else, NO cout statements
double takeHomePay(double basePay, double tax)
{
	return basePay * (1 - tax);
}

//return factorial of given positive integer
int factorial(int n)
{
	int prod=1;

	for (int i = 1; i <= n; i++)
	{
		prod = prod * i;
	}

	return prod;
}

//A function that returns true if the first number is greater than the
//2nd, and false otherwise
bool isGreater(double x, double y)
{
	if (x > y)
	{
		return true;
	}
	else
	{
		return false;
	}
}

//return x squared
double squared(double x)
{
	double result;
	result = x * x;

	return result;
}

//increment value of given variable by 1
//& means pass by reference
void increment(int &n)
{
	n = n + 1;
}

int main()
{
	//Quiz:
	//1:  Write a function that take as input a phase and a number n,
	//and prints that phase n times.
	annoying("Are we there yet?", 5);

	//Should print:
	//Are we there yet?
	//Are we there yet?
	//Are we there yet?
	//Are we there yet?
	//Are we there yet?

	//Quiz question 2:
	//Write function that takes as input your money earned
	//before taxes, as well as the tax rate,
	//and returns the takehome pay amount.
	cout << "I get to take home " << takeHomePay(500, .10) << " dollars." << endl; //I get to take home 450 dollars

	//Challenge #1:
	cout << "Factorial of your number is: " << factorial(4) << endl; //24
	cout << "Factorial of your number is: " << factorial(6) << endl; //720
	cout << "Factorial of your number is: " << factorial(10) << endl;//3.6 million
	cout << "Factorial of your number is: " << factorial(15) << endl;//2 billion
	cout << "Factorial of your number is: " << factorial(20) << endl;//uh oh, too big for a positive int (31-bits)

	//Challenge #2:  isGreater, squared, printRange
	if (isGreater(70, 3.14))
	{
		cout << "Yep 70 is bigger than 3.14" << endl;
	}
	else
	{
		cout << "Nope, 70 is not bigger than 3.14" << endl;
	}

	cout << isGreater(2, 15) << endl;  //false
	cout << isGreater(3.14, 3.14) << endl; //false
	cout << isGreater(50, 20) << endl; //true

	//squared
	cout << squared(5) << endl; //25
	cout << squared(12) << endl; //144
	cout << squared(-4) << endl; //16


	//Challenge #3: summation


	//Challenge #4: pow

	///////////// Pass by reference /////////////

	//Challenge #5: Write a function to increment an int variable by one.
	int x = 5;
	increment(x);
	cout << x << endl; //6
	increment(x);
	increment(x);
	cout << x << endl; //8

	//Challenge #6: squareIt

	//Challenge #7: swap

	//hwk questions?

	return 0;
}