Dynamic memory allocation and release

Dynamic memory allocation and release

In C++, we can use the keywords newand deleteto allocate and release dynamic memory. Dynamic memory allocation allows us to create and use memory on demand while the program is running, which is very useful for dealing with dynamic data structures and flexible memory management.

Dynamic memory allocation using new

The keyword newcan be used to dynamically allocate memory space for a single object. Here's newan example of creating a single object using:

int* p = new int;  // 分配一个 int 类型的内存空间，并将指针 p 指向该空间

In the above example, new inta memory space of type is allocated intand a pointer to that space is returned. Pointer pis used to store the pointer value.

Instead of allocating a single object, we can also newallocate an array of objects using . Here's newan example of creating an array of objects using:

int size