126 lines
2.8 KiB
C++
126 lines
2.8 KiB
C++
#include <iostream>
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#include <Windows.h>
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#include <memory>
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#include "functions.h"
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#include "ClassA.h"
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int number = 0;
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using namespace std;
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void functionB() {}
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void functionC();
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void functionD(); // forward declaration
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int main()
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{
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//std::cout << "Hello World!" << std::endl;
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//cout << "Hallo" << endl;
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////functionA(); // compiler error - function not defined
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//functionB(); // no error
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////functionC(); // linker error - function declared, but not defined
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//functionD(); // no error
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////functionE(); // linker error - function is defined twice, because of two includes in two source files
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//functionF(); // no error
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//short s = 0;
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//unsigned short us = 0;
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//int i = 0;
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//long l = 0;
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//cout << "size of short: " << sizeof(s) << endl;
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//cout << "size of int: " << sizeof(i) << endl;
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//cout << "size of long: " << sizeof(l) << endl;
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//cout << "size of long long: " << sizeof(long long) << endl;
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//cout << "size of bool: " << sizeof(bool) << endl;
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//BYTE b;
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//cin >> number;
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//cout << "number: " << number << endl;
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//char c;
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//cin >> c;
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//cout << "c: " << c << endl;
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//string str;
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//cin >> str;
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//cout << "str: " << str << endl;
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//char sz[128];
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//cin >> sz;
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//cout << "sz: " << sz << endl;
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//cin >> sz;
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//cout << "sz: " << sz << endl;
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//int numbers[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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//int* pNumber = new int(0);
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//cout << "local array print" << endl;
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//for (size_t i = 0; i < sizeof(numbers) / sizeof(int); i++)
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//{
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// std::cout << numbers[i] << " ";
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//}
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//std::cout << std::endl;
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//cout << "function array print" << endl;
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//printArray(numbers, size(numbers));
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//int n = 1;
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//changeInt(n);
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//cout << "n (" << &n << "): " << n << endl;
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//changeIntPointer(&n);
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//cout << "n (" << &n << "): " << n << endl;
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//int* pN = nullptr;
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//int* pN2 = new int;
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//*pN2 = 1234;
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//delete pN2;
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//pN2 = nullptr;
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//if (pN2 != nullptr)
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//{
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// *pN2 = 1234;
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//}
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//pN = new int;
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//*pN += 10;
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//pN = new int; // BAD - Memory Leak
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//changeIntReference(n);
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//cout << "n (" << &n << "): " << n << endl;
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//unique_ptr<int> un = make_unique<int>(0);
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//*un = 10;
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////unique_ptr<int> un2 = un; // not possible, because it is unique
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//shared_ptr<int> sn = make_shared<int>(0);
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//*sn = 10;
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//cout << "sn refs: " << sn.use_count() << endl;
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//shared_ptr<int> sn2 = sn;
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//cout << "sn refs: " << sn.use_count() << endl;
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//sn.reset();
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//cout << "sn refs: " << sn.use_count() << endl;
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//cout << "sn2 refs: " << sn2.use_count() << endl;
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//weak_ptr<int> wn = sn2;
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//cout << "sn2 refs: " << sn2.use_count() << endl;
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//if (!wn.expired())
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//{
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// shared_ptr<int> ln = wn.lock();
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// *ln *= 23;
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// cout << "sn2 refs: " << sn2.use_count() << endl;
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//}
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//cout << "sn2 refs: " << sn2.use_count() << endl;
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ClassA classA;
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ClassA classA2 = classA;
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return 0;
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}
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void functionA() {}
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void functionD() {} |