Embedded C Interview Questions | Pointers in C | void pointer | Null Pointer | Dangling Pointer
In C programming, a pointer is a variable that stores the memory address of another variable. Pointers are fundamental for tasks such as low-level memory manipulation and dynamic memory allocation.
Key concepts include:
Address-of Operator (&): Returns the memory address of a variable.
Dereference Operator (*): Accesses the value stored at the address held by the pointer.
A pointer is declared with a data type matching the variable it will point to.
Common types include Null, Void, Dangling, and Wild pointers.
Pointers are used for dynamic memory allocation, pass by reference, arrays, complex data structures, and function pointers.
Null Pointer: Intentionally points to no valid memory location, typically indicated by the value NULL or 0.
Void Pointer: A generic pointer that can hold the address of any data type but cannot be directly dereferenced without typecasting.
Wild Pointer: An uninitialized pointer that points to an arbitrary memory location, leading to undefined behaviour if used.
Dangling Pointer: Points to a memory location that has been deallocated or freed, making the address invalid.
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