add collections

add pointers

CPlusPlus/Collections/main.cpp

@@ -0,0 +1,88 @@
+#include <iostream>
+#include <vector>
+#include <list>
+
+#include "grid.h"
+
+using namespace std;
+
+void printArray(int numbers[]);
+void printArray(int numbers[], size_t count);
+
+int main()
+{
+	// C arrays
+	int numbers[10];
+
+	for (size_t i = 0; i < 10; i++)
+	{
+		numbers[i] = 0;
+	}
+
+	int numbers2[] = { 0, 1, 2, 3, 4 };
+	int numbers3[10] = { 0, 1, 2, 3, 4 };
+
+	numbers[0] = 10;
+
+	cout << "numbers[5]: " << numbers[5] << endl;
+
+	// 2D array - 10 columns, 5 rows
+	int grid[COLUMNS * ROWS] = {};
+	grid[calculateIndex(3, 2)] = 10; // 4th column, 3rd row
+
+	// size has to be always constant
+	const int count = 10;
+	int numbers4[count] = {};
+
+	int length = sizeof(numbers) / sizeof(numbers[0]); // works only with local constant sized arrays
+	for (size_t i = 0; i < size(numbers); i++) // works only with local constant sized arrays, but it is safer than sizeof
+	{
+		cout << numbers[i] << " ";
+	}
+	cout << endl;
+
+	printArray(numbers);
+	printArray(numbers, size(numbers));
+
+	// "dynamic" (...) arrays
+
+	// stl collections
+	vector<int> numbers5;
+	vector<int> numbers6 = { 0, 1, 2, 3, 4 };
+	numbers5.push_back(10); // add an item at the end
+	numbers5.pop_back(); // remove the last item
+	numbers6[1] *= 2;
+	vector<int> numbers7;
+	numbers7.reserve(100);
+	numbers7.shrink_to_fit();
+
+	printArray(numbers6.data(), numbers6.size());
+
+	list<int> numbersList;
+	numbersList.push_back(10);
+	numbersList.push_front(0);
+	//numbersList[0] = 5; // random access is not available for lists
+
+	return 0;
+}
+
+void printArray(int numbers[])
+{
+	int length = sizeof(numbers) / sizeof(numbers[0]); // works not outside of the local scope
+	cout << "sizeof(numbers): " << sizeof(numbers) << endl;
+	
+	//for (size_t i = 0; i < size(numbers); i++) // size is not working outside of the local scope
+	//{
+	//	cout << numbers[i] << " ";
+	//}
+	//cout << endl;
+}
+
+void printArray(int numbers[], size_t count)
+{
+	for (size_t i = 0; i < count; i++)
+	{
+		cout << numbers[i] << " ";
+	}
+	cout << endl;
+}