#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; 

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

	while (keepTrading)
	{
		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; 
		}

		if (stockShares > 0 && expectedPrice*1.02 < stockPrice)
		{
			cash = cash + stockPrice; 
			stockShares = stockShares - 1; 
		}

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

	} // end while

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