Principles of Inheritance and Variation: Exhaustive Study Notes

A pointer is a variable that stores the memory address of another variable.
In C and C++, pointers are crucial for dynamic memory allocation and data structure manipulation.
Syntax to declare a pointer: datatype *pointerName;
Dereferencing a pointer allows you to access or modify the value at the address it points to: *pointerName.
Pointers can also be used for arrays; the name of an array acts as a pointer to its first element.
Pointer arithmetic is possible (e.g., ptr + 1 moves to the next element based on its data type size).
A null pointer points to nothing: pointerName = NULL;, indicating that it does not currently reference a valid memory location.
Always ensure pointers are initialized before dereferencing to avoid undefined behavior.
Common use cases include dynamic array allocation and linked lists.
In modern C++, consider using smart pointers (std::unique_ptr, std::shared_ptr) to manage memory automatically and prevent memory leaks.