add intro

CPlusPlus/intro/main.cpp

@@ -0,0 +1,118 @@
+#include <iostream>
+#include <Windows.h>
+#include <memory>
+#include "functions.h"
+#include "ClassA.h"
+
+using namespace std;
+
+void functionB() {}
+void functionC();
+void functionD(); // forward declaration
+
+int main()
+{
+	//std::cout << "Hello World!" << std::endl;
+	//cout << "Hallo" << endl;
+
+	////functionA(); // compiler error, function is not declared, but defined afterwards
+	//functionB(); // no error
+	////functionC(); // linker error, function is declared, but not defined
+	//functionD(); // no error
+	////functionE(); // linker error, function is defined in header and included in two different source files
+	//functionF(); // no error
+
+	//short s = 0;
+	//unsigned short us = 0;
+	//int i = 0;
+	//long l = 0;
+
+	//cout << "sizeof short: " << sizeof(s) << endl;
+	//cout << "sizeof int: " << sizeof(i) << endl;
+	//cout << "sizeof long: " << sizeof(l) << endl;
+	//cout << "sizeof long long: " << sizeof(long long) << endl;
+	//cout << "sizeof bool: " << sizeof(bool) << endl;
+
+	//BOOL b;
+
+	//int number;
+	//cin >> number;
+	//cout << "number: " << number << endl;
+
+	//char c;
+	//cin >> c;
+	//cout << "c: " << c << endl;
+
+	//string str;
+	//cin >> str;
+	//cout << "str: " << str << endl;
+
+	//char sz[128];
+	//cin >> sz;
+	//cout << "sz: " << sz << endl;
+	//cin >> sz;
+	//cout << "sz: " << sz << endl;
+
+	//int numbers[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+	//cout << "print local array" << endl;
+	//for (size_t i = 0; i < sizeof(numbers) / sizeof(int); i++)
+	//{
+	//	cout << numbers[i] << " ";
+	//}
+	//cout << endl;
+
+	//cout << "print remote array" << endl;
+	//printArray(numbers, size(numbers));
+
+	//int n = 1;
+	//changeInt(n);
+	//cout << "n (" << &n << "): " << n << endl;
+	//changeIntPointer(&n);
+	//cout << "n (" << &n << "): " << n << endl;
+	//changeIntReference(n);
+	//cout << "n (" << &n << "): " << n << endl;
+
+	//int* pNumber = nullptr;
+	//int* pNumber2 = new int;
+	//
+	//if (pNumber2 != nullptr)
+	//{
+	//	delete pNumber2;
+	//	pNumber2 = nullptr;
+	//}
+
+	//pNumber = new int;
+	//*pNumber += 10;
+	//pNumber = new int; // BAD - Memory Leak
+
+	//unique_ptr<int> un = make_unique<int>(0);
+	//*un = 100;
+	//
+	//shared_ptr<int> sn = make_shared<int>(0);
+	//*sn = 10;
+	//cout << "sn refs: " << sn.use_count() << endl;
+	//shared_ptr<int> sn2 = sn;
+	//cout << "sn refs: " << sn.use_count() << endl;
+	//sn.reset();
+	//cout << "sn refs: " << sn.use_count() << endl;
+	//cout << "sn2 refs: " << sn2.use_count() << endl;
+
+	//weak_ptr<int> wn = sn2;
+	//if (!wn.expired())
+	//{
+	//	shared_ptr<int> ln = wn.lock();
+	//	*ln = 1234;
+	//	cout << "sn2 refs: " << sn2.use_count() << endl;
+	//}
+	//cout << "sn2 refs: " << sn2.use_count() << endl;
+
+	ClassA classA;
+	ClassA classA2 = classA;
+
+	return 0;
+}
+
+void functionA() {}
+
+void functionD() {}