How do you allocate memory dynamically in C++?

Dynamically allocating memory in C++ is primarily accomplished using the new keyword. This mechanism not only allocates memory but also calls the constructor for object initialization, which is a critical feature when working with class instances.

Using the new keyword allows developers to create objects at runtime, offering flexibility in managing memory according to the program's needs. For example, when you create an object with the new keyword, you can store its address in a pointer variable, enabling you to access and manipulate the object throughout its lifecycle.

The other methods mentioned, such as malloc() and alloc(), are not the standard ways to allocate memory in C++. While malloc() is available in C and can be used in C++, it does not invoke constructors for C++ objects, making it less suitable for dynamic object management in C++. Similarly, there is no alloc() function in standard C++. The create keyword also does not exist in C++ for memory allocation. Therefore, the new keyword is the correct and only proper method for dynamic memory allocation in C++ that aligns with object-oriented programming principles.