#include <iostream>
#include <iomanip>
#include <string>
#include <cstdlib> // need for rand()
#include <ctime>   // need for rand()

using namespace std; 

static double cash = 1000.00, 
	stockPrice = 10.0, 
	expectedPrice; 
static int stockShares; 

const bool DEBUG_first_five = true; // debugging for the first five iteration
const bool DEBUG_every_1000 = false; // debugging for every 1000th iteration

int DEBUG_counter = 0; 

void main()
{
	srand(time(NULL)); 
	cout << fixed << showpoint << setprecision(2); 
	bool keepTrading = true; 

	while (keepTrading)
	{
		// debug for loop
		if (DEBUG_first_five)
		{
			DEBUG_counter++; 
			cout << "[" << DEBUG_counter << "]: " 
				<< "cash = " << cash
				<< "; stockShares = " << stockShares
				<< "; stockPrice = " << stockPrice
				<< "; value = " << (cash+stockShares*stockPrice) << endl; 
		}
		if (DEBUG_every_1000)
		{
			DEBUG_counter++; 
			if (DEBUG_counter % 1000 == 0)
				cout << "[" << DEBUG_counter << "]: " 
					<< "cash = " << cash
					<< "; stockShares = " << stockShares
					<< "; stockPrice = " << stockPrice
					<< "; value = " << (cash+stockShares*stockPrice) << endl; 
		}

		stockPrice = stockPrice + static_cast<double>(rand()-RAND_MAX/2)/RAND_MAX; 
		if (stockPrice <= 0)
			stockPrice = 0.02; 

		expectedPrice = stockPrice + static_cast<double>(rand()-RAND_MAX/2)/RAND_MAX; 

		if (cash > stockPrice && expectedPrice > stockPrice*1.01)
		{
			cash = cash - stockPrice; 
			stockShares = stockShares + 1; 
			// debug for buy
			if (DEBUG_first_five)
			{
				cout << "[buy" << stockShares << "]: " 
					<< "cash = " << cash
					<< "; stockShares = " << stockShares
					<< "; stockPrice = " << stockPrice
					<< "; value = " << (cash+stockShares*stockPrice) << endl; 
			}
			if (DEBUG_every_1000)
			{
				if (DEBUG_counter % 1000 == 0)
					cout << "[buy" << stockShares << "]: " 
						<< "cash = " << cash
						<< "; stockShares = " << stockShares
						<< "; stockPrice = " << stockPrice
						<< "; value = " << (cash+stockShares*stockPrice) << endl; 
			}
		}

		if (stockShares > 0 && expectedPrice*1.02 < stockPrice)
		{
			cash = cash + stockPrice; 
			stockShares = stockShares - 1; 
			// debug for sell
			if (DEBUG_first_five)
			{
				cout << "[sell" << stockShares << "]: " 
					<< "cash = " << cash
					<< "; stockShares = " << stockShares
					<< "; stockPrice = " << stockPrice
					<< "; value = " << (cash+stockShares*stockPrice) << endl; 
			}
			if (DEBUG_every_1000)
			{
				if (DEBUG_counter % 1000 == 0)
					cout << "[sell" << stockShares << "]: " 
						<< "cash = " << cash
						<< "; stockShares = " << stockShares
						<< "; stockPrice = " << stockPrice
						<< "; value = " << (cash+stockShares*stockPrice) << endl; 
			}
		}

		if (cash+stockShares*stockPrice == 500)
			keepTrading = false; 
		if (cash+stockShares*stockPrice == 2000)
			keepTrading = false; 

		// loop controller for debug
		if (DEBUG_first_five && DEBUG_counter == 5)
			keepTrading = false; 
		if (DEBUG_every_1000 && DEBUG_counter == 5000)
			keepTrading = false; 

	} // end while

	cout << "You now have $" << (cash+stockShares*stockPrice) << endl; 
}