#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <fstream>

using namespace std;

int sum(int a, int b)
{
	int c;
	c = a + b;
	return c;
}

bool isNumber(char Symbol)
{
	if (Symbol >= '0' && Symbol <= '9')
	return true;
	return false;
}

void registration(string name1, string pass1, bool IsRegistered)
{
	cout << "Your username: ";
	cin >> name1;
	cout << "Your password: ";
	cin >> pass1;
	ofstream fout;
	fout.open(name1);
	fout << "Username = " << name1 << endl;
	fout << "Password = " << pass1 << endl;
	cout << "Great! You've signed up! Now come check your math calculation skills!" << endl;
	cout << "If you wish to leave the game, type in F" << endl;
	IsRegistered = true;
}

void check(int a, int b, int c, int v, int solved, string name1)
{
	c = sum(a, b);
	if (c == v)
	{
		cout << "Your answer is correct";
		cout << endl;
		solved++;
	}
	else
	{
		cout << "Your answer is incorrect";
		cout << endl;
	}
}

void output(int a, int b, int c, int v, int solved, string name1)
{
	srand((unsigned)time(NULL));
	a = 1 + rand() % 1000;
	b = 1 + rand() % 1000;
	heh:
	cout << "Solve it - " << a << " + " << b << endl;
	cout << "Your answer: ";
	cin >> v;

	if (v > 9999)
	{
		cout << "Sorry, your number cannot be so big." << endl;
		goto heh;
	}
	else
	{
		check(a, b, c, v, solved,name1);
		output(a, b, c, v, solved, name1);
	}
}

int main()
{
	//bool correct = false;
	srand((unsigned)time(NULL));
	int v = 0;
	int a = 0;
	int b = 0;
	int c = 0;
	int solved = 0;
	string name1, pass1;
	bool IsRegistered = false;

	registration(name1, pass1, IsRegistered);
	output(a, b, c, v, solved, name1);
	system("pause");
}