new and delete c++ code example

Example 1: c++ delet from memory

// Delete pointer
int* ptr1 = new int;
delete ptr1;

// Delete array
int* array = new int[10];
delete[] array;

Example 2: declare dynamic array c++

int main()
{
  int size;

  std::cin >> size;

  int *array = new int[size];

  delete [] array;

  return 0;
}

Example 3: c++ delete dynamically allocated array

int length = 69;
int * numbers = new int[length];
delete[] numbers;

Example 4: new and delete operator in c++

// Pointer initialized with NULL
// Then request memory for the variable
int *p = NULL; 
p = new int;   

            OR

// Combine declaration of pointer 
// and their assignment
int *p = new int;