#include <iostream>
using namespace std;

class MainClass
{
	int age = 21;
	friend class BackDoor;
public:
	static int staticN1;
	static const int staticN2 = 22;
	int idNum = 7854;
};

int MainClass::staticN1 = 11;

class BackDoor
{
public:
	void PrintFromMainClass(const MainClass& refMainClass) const
	{
		cout << refMainClass.age << endl;
		cout << refMainClass.staticN1 << endl;
		cout << refMainClass.staticN2 << endl;
	}
};

int main()
{
	MainClass MainClass1;

	cout << MainClass::staticN1 << endl;
	cout << MainClass().staticN1 << endl;
	cout << MainClass1.staticN1 << endl;
	//cout << staticN1 << endl; //NOT WORK, need Class or instance of class

	BackDoor BD1;
	BD1.PrintFromMainClass(MainClass1);
	//cout << BD1.idNum << endl;//NOT WORK, Need to access thru instance of source class

	return 0;
}
/*
11
11
11
21
11
22
*/

#include <iostream>
#include<vector>
using namespace std;

int main()
{
	std::size_t width = 100;
	std::size_t height = 20;
	std::vector<int> map(width * height);

	//Print with index
	for (std::size_t y = 0; y < height; ++y)
	{
		for (std::size_t x = 0; x < width; ++x)
		{
			size_t index = x + y * width;
			map[index] = index;
			cout << "[" << index << "] = " << map[index] << endl;
		}
		cout << endl; 
	}

	cout << "***************" << endl;
	cout << "***************" << endl;

	//Print with width/height
	for (std::size_t y = 0; y < height; ++y)
	{
		for (std::size_t x = 0; x < width; ++x)
		{
			cout << map[x + y * width] << ", ";
		}

		cout <<"\b  \n\n";
	}

	cout << "***************" << endl;
	cout << map.size() << endl;
	cout << map.capacity() << endl;
	cout << "***************" << endl;

	return 0;
}

#include <iostream>
#include<string>

using namespace std;

int main()
{
	char inputChar{ 'y' };
	string str1{};
	do
	{
		cout << "Enter a multi-string: ";
		getline(cin, str1);
		cout << "YOU ENTERED = " << str1 << endl;

		cout << "Enter more strings (y/n): ";
		cin >> inputChar;
		cin.ignore();

	} while (inputChar != 'n');
	

	//Test successive cin>>
	cout << "Want eggs: ";
	cin >> inputChar;
	if (inputChar == 'y') cout << "You want eggs!" << endl;

	cout << "Want bacon: ";
	cin >> inputChar;
	if (inputChar == 'y') cout << "You want bacon!" << endl;

	cout << "Want salt: ";
	cin >> inputChar;
	if (inputChar == 'y') cout << "You want salt!" << endl;


	char c{ };
	cout << c << endl;

	char c1{'\0'};
	cout << c1 << endl;

	char c2 = {'\0'};
	cout << c2 << endl;

	char c3 = '\0';
	cout << c3 << endl;

	char c4{ 0 };
	cout << c4 << endl;

	char c5 = { 0 };
	cout << c5 << endl;

	char c6 = 0 ;
	cout << c6 << endl;

	char c7 = NULL;	//Seems to work, NULL macro (#define NULL 0)
	cout << c7 << endl;

	char c8 = char(0);	//unncessary conversion
	cout << c8 << endl;

	return 0;
}

#include <sstream>
#include <iostream>
#include <string>

using namespace std;

int main()
{
	std::istringstream stream(" Hello 1.5 2.7");
	
	// stream buffer content: " Hello 1.5 2.7"
	
	std::string str;
	stream >> str;
	std::cout << "'" << str << "'\n"; // prints 'Hello'
	
	// stream buffer content: " 1.5 2.7"
	
	double dval;
	stream >> dval;
	std::cout << dval << "\n"; // prints 1.5
	
	// stream buffer content: " 2.7"
	
	int ival;
	stream >> ival;
	std::cout << ival << "\n"; // prints 2
	
	// stream buffer content: ".7"
}

#include <sstream>
#include <iostream>
#include <string>

using namespace std;

int main()
{
	std::istringstream stream("Test\n  x y 67 Test whatever    \n");
	
	// stream buffer content: "Test\n  x y 67 Test whatever    \n"
	
	std::string line1;
	std::getline(stream, line1);
	std::cout << "'" << line1 << "'\n"; // prints 'Test'
	
	// stream buffer content: "  x y 67 Test whatever    \n"
	
	std::string line2;
	std::getline(stream, line2);
	std::cout << "'" << line2 << "'\n"; // prints '  x y 67 Test whatever    '
	
	// stream buffer content: ""
}

#include <sstream>
#include <iostream>
#include <string>

using namespace std;

int main()
{
	std::istringstream stream("A B\nApe\nBird\n");
	
	// stream buffer content: "A B\nApe\nBird\n"
	
	std::string a;
	stream >> a;
	std::cout << "'" << a << "'\n"; // prints 'A'
	
	// stream buffer content: " B\nApe\nBird\n"
	
	std::string b;
	std::getline(stream, b);
	std::cout << "'" << b << "'\n"; // prints ' B'
	
	// stream buffer content: "Ape\nBird\n"
	
	std::string c;
	stream >> c;
	std::cout << "'" << c << "'\n"; // prints 'Ape'
	
	// stream buffer content: "\nBird\n"
	
	std::string d;
	std::getline(stream, d);
	std::cout << "'" << d << "'\n"; // prints ''
	
	// stream buffer content: "Bird\n"
}