From b68542a9ffa71c51a7481df8fa12e7fc41c7ab77 Mon Sep 17 00:00:00 2001
From: Stoycho Kyosev <68247567+stoychoX@users.noreply.github.com>
Date: Wed, 6 Apr 2022 16:36:40 +0300
Subject: Add files via upload

---
 pract KN/week7/solution/game.cpp | 154 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 pract KN/week7/solution/game.cpp

(limited to 'pract KN/week7/solution/game.cpp')

diff --git a/pract KN/week7/solution/game.cpp b/pract KN/week7/solution/game.cpp
new file mode 100644
index 0000000..7adc45c
--- /dev/null
+++ b/pract KN/week7/solution/game.cpp	
@@ -0,0 +1,154 @@
+#include "game.h"
+#include<iostream>
+#include<time.h>
+#include<cmath>
+
+void game::generateNumber() {
+	srand(time(NULL));
+
+	number = rand() % 100 + 1;
+}
+
+void game::validateBet(double& bet, double currentMoney) const {
+	std::cout << "How much money would you like to bet? " << std::endl
+		<< "Your money now: " << currentMoney << std::endl;
+
+	bool fail = false;
+
+	do {
+		if (fail)
+			std::cout << "Invalid input" << std::endl;
+
+		std::cin >> bet;
+
+		fail = true;
+
+		// Проверява дали сме въвели текстов низ вместо число
+		// и поправя потока.
+		if (!(bool)(std::cin)) {
+			std::cin.clear();
+			std::cin.ignore(255, '\n');
+		}
+
+	} while (bet > currentMoney || bet < 0);
+}
+
+void game::validateNumber(int& num) const {
+	std::cout << "Enter your number: ";
+
+	bool fail = false;
+
+	do {
+		if (fail)
+			std::cout << "Try again" << std::endl;
+
+		std::cin >> num;
+
+		if (!(bool)(std::cin)) {
+			std::cin.clear();
+			std::cin.ignore(255, '\n');
+		}
+
+		fail = true;
+
+	} while (num < 20 || num > 60);
+}
+
+double game::getRate(betType currentBet) const {
+	double rate = 0;
+	int myNumber = 0;
+
+	switch (currentBet) {
+	case betType::isEven:
+		rate = !(number % 2) ? 0.2 : -1;
+		break;
+	case betType::isNotEven:
+		rate = !(number % 2) ? -1 : 0.2;
+		break;
+	case betType::isPrime:
+		rate = isPrime(number) ? 0.5 : -1;
+		break;
+	case betType::isPowerOfTwo:
+		rate = isPowerOfTwo(number) ? 1 : -1;
+		break;
+	case betType::isBiggerThan:
+		validateNumber(myNumber);
+		rate = (myNumber > number) ? 0.25 : -1;
+		break;
+	case betType::isSmallerThan:
+		validateNumber(myNumber);
+		rate = (myNumber < number) ? 0.25 : -1;
+		break;
+	case betType::isTheSameAs:
+		validateNumber(myNumber);
+		rate = (myNumber == number) ? 10 : -1;
+		break;
+	}
+
+	return rate;
+}
+
+void game::play(player& p) {
+	if (p.getAge() < 18) {
+		std::cout << "You are too young" << std::endl;
+		return;
+	}
+
+	char buff[20];
+	std::cout << "Enter your password, " << p.getName() << ": ";
+	std::cin.getline(buff, 20, '\n');
+
+	if (!p.comparePassword(buff)) {
+		std::cout << "Wrong password. Goodbye.";
+		return;
+	}
+
+	while (!p.isBroke()) {
+		double myBet = 0;
+
+		betType currentBet = p.makeBet();
+
+		generateNumber();
+
+		validateBet(myBet, p.getMoney());
+		
+		p.updateMoney(myBet, getRate(currentBet));
+
+		std::cout << "The number was: " << number << std::endl;
+	}
+
+	std::cout << "You lost all your money!" << std::endl;
+}
+
+// Bonus -> Newton's method for finding square root
+// https://math.mit.edu/~stevenj/18.335/newton-sqrt.pdf
+// Formula: a_n = 0.5 * (a_{n-1} + number / a_{n-1})
+double newtonSquareRoot(double num, int l = 100) {
+	double result = 1;
+	double temp = 1;
+
+	for (int i = 0; i < l; i++) {
+		temp = 0.5 * (result + num / result);
+
+		if (temp == result && result != 1)
+			return result;
+
+		result = temp;
+	}
+
+	return result;
+}
+
+bool isPrime(int num) {
+	// int border = sqrt(num); is perfectly fine!
+	int border = newtonSquareRoot(num);
+
+	for (int i = 2; i <= border; i++)
+		if (num % i == 0)
+			return false;
+	return true;
+}
+
+bool isPowerOfTwo(int num) {
+	return num != 0 && ((num & (num - 1)) == 0);
+}
\ No newline at end of file
-- 
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