Pointer: A variable that stores the memory address of another variable. It allows indirect access and manipulation of data in memory.
Address-of Operator (&): An operator that returns the memory address of a variable. Example: &var gives the address of var.
Dereference Operator (*): An operator used to access or modify the value stored at the memory address a pointer points to. Example: *ptr accesses the value at the address stored in ptr.
Null Pointer: A special pointer value (NULL) indicating that the pointer does not currently point to any valid memory location. Used for initialization and safety.
Pointer to Pointer (Double Pointer): A pointer that stores the address of another pointer, enabling multi-level indirection. Declared as type**.
Pointer and Arrays Relationship: The name of an array evaluates to the address of its first element. Arrays and pointers are closely related, allowing array elements to be accessed via pointer arithmetic.
1. What is a pointer in programming?
2. What is the primary purpose of a pointer in C programming?
3. Which of the following correctly demonstrates the syntax for declaring an integer pointer in C?
Pointer — definition?
Variable storing a memory address.
Pointer — definition?
Variable storing another variable's memory address.
Pointer declaration — syntax?
Data type followed by * (e.g., int *p;).
Address-of Operator (&) — purpose?
Returns variable’s memory address.
Pointer and arrays — relationship?
Array name evaluates to address of first element.
Dereference Operator (*) — function?
Accesses/modifies value at pointer’s address.
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