when to use dynamic array in c++ code example

Example 1: declare dynamic array c++

int main()
{
  int size;

  std::cin >> size;

  int *array = new int[size];

  delete [] array;

  return 0;
}

Example 2: dynamic array cpp

#include <iostream>

int main()
{
	int size;

	std::cin >> size;

	int* array = new int[size];

	delete[] array;

	return 0;
}