for dailyprogrammer challenge 161 easy

blackjack.cpp

#include <iostream>
#include <vector>
#include <numeric>
#include <algorithm>
#include <string>

/* The following function will create a vector made up of a certain number
of individual decks. The structure of a deck is all integers from
zero to fifty-one inclusive.*/
std::vector<int> createDeck(int amount) {
	std::vector<int> singleDeck(52);
	std::iota(std::begin(singleDeck), std::end(singleDeck), 0);
	std::vector<int> x;
	for (int a = 0; a < amount; a++) { //put in a given amount of decks into the big deck
		x.reserve(singleDeck.size()); 
		x.insert(x.end(), singleDeck.begin(), singleDeck.end());
	}
	return x;
}

/* This function is for the output later on. Given a card from the vector, it matches it to a suit.
First 13 are diamonds, and so on.*/
std::string getSuit(int index) {
	if (index / 13 == 0) {
		return "Diamond";
	}
	else if (index / 13 == 1) {
		return "Club";
	}
	else if (index / 13 == 2) {
		return "Heart";
	}
	else if (index / 13 == 3) {
		return "Spade";
	}
}

/* This function will fix the values of face cards so that they are all equal to 10 when
we sum up the values to see if we got blackjack. */

int valueFixer(int value) {
	if (value == 0) {
		value = 11;
		return value;
	}
	else if (value == 10) {
		value = 10;
		return value;
	}
	else if (value == 11) {
		value = 10;
		return value;
	}
	else if (value == 12) {
		value = 10;
		return value;
	}
	else {
		return value;
	}
}

// This function will match face cards to values when we output all of the combinations.
std::string faceCardHandler(int value) {
	if (1 <= value <= 9) {
		return std::to_string(value);
	}
	else if (value == 0) {
		value = 11;
		return "Ace";
	}
	else if (value == 10) {
		value = 10;
		return "Jack";
	}
	else if (value == 11) {
		value = 10;
		return "Queen";
	}
	else if (value == 12) {
		value = 10;
		return "King";
	}
}

int main() {
	int numberOfDecks, handsToPlay;
	std::vector<int> deck;
	std::cout << "Input the number of decks to shuffle together"
		<< "followed by the number of two card hands to deal. If a"
		<< "hand has a value of 11 or less, another card will be dealt." << std::endl;
	std::cin >> numberOfDecks >> handsToPlay;
	deck = createDeck(numberOfDecks);
	std::random_shuffle(deck.begin(), deck.end());
	int counter = 0, blackJackCounter = 0;
	while (counter < handsToPlay) {
		int total = 0; //Pop out 2 cards and add them total.
		std::string output;
		total += valueFixer(deck.back());
		output += (' ' + getSuit(deck.back()) + ' ' + faceCardHandler(deck.back()));
		deck.pop_back();
		total += valueFixer(deck.back());
		output += (' ' + getSuit(deck.back()) + ' ' + faceCardHandler(deck.back()));
		deck.pop_back();
		if (total <= 11) { //If total < 11, pull out a third card.
			total += valueFixer(deck.back());
			output += (' ' + getSuit(deck.back()) + ' ' + faceCardHandler(deck.back()));
			deck.pop_back();
		}
		else if (total == 21) {
			std::cout << "Blackjack!";
			blackJackCounter += 1;
		}
		std::cout << output << std::endl;
		counter++;
	}
	float blackJackCounterFloat = blackJackCounter, handsToPlayFloat = handsToPlay; //Needed for percent calc.
	std::cout << "There were " << blackJackCounter << " blackjacks. This was an incidence of " << blackJackCounter
	<< " out of " << handsToPlay << " or " << (blackJackCounterFloat/handsToPlayFloat)*100 << " percent." << std::endl;
}