Vector.txt

	 				0- empty(): it returns whether the container is empty or not.
/*
	if (num.empty() == false)
		std::cout << "Vector is not empty";
	else
		std::cout << "Vector is empty";
 */

					1- Fill vector
/*
	int main()
	{
		std::vector<int> num; // Declaration of Vector in c++

		// Initializing vector with values from 1 to 7;
		for (int i = 1; i <= 7; i++)
			num.push_back(i);
	}
*/

					2- Delete Elements from C++ Vectors
/*
  std::vector<int> num;


  // declare iterator to iterate through Vector using iterators
  std::vector<int>::iterator iter;

  //use iterator with for loop
  for (iter = num.begin(); iter != num.end(); ++iter)
  {
  		std::cout << *iter << " ";
  }
  return 0;
*/

					3- Access Elements of a Vector
/*
//	==> In C++, we use the index number to access the vector elements.
//	==> Here, we use the "at()" function to access the element from the special index.

	int main() {
		std::vector<int> num;

		std::cout << num.at(2) << std::endl;
		std::cout << num.at(0) << std::endl;
		return (0);
	}
	
 */

					4- Change Vector Element
/*
	int main() {
		std::vector<int> num{1, 2, 3, 4,  5};

		std::vector::iterator iter;
		for (iter = num.begin(); iter != num.end(); ++iter)
			std::cout << *iter << " ";

		std::cout << std::endl;

		// change elements at indexes 1 and 4
		
		num.at(1) = 0;
		num.at(4) = 7;

		for (iter = num.begin(); iter != num.end(); ++iter)
			std::cout << *iter << " ";

		std::cout << std::endl;
	}
 */


				 5- erase() : remove elements from a specified element or a range in the vector
/*
		// removing the first element
		num.erase(num.begin());
 */

// https://www.freecodecamp.org/news/cpp-vector-how-to-initialize-a-vector-in-a-constructor/

// erase :   https://www.bitdegree.org/learn/c-plus-plus-vector