C Pointers and Arrays

 C Pointers and Arrays (Beginner → Advanced)

Pointers and arrays are closely related in C.
Understanding this relationship is mandatory for DSA, memory concepts, embedded systems, and interviews.

 Relationship Between Pointers and Arrays

->Array name itself is a pointer to the first element of the array.

• arr → address of arr[0]

• &arr[0] → same address

 Array Access Using Pointer Arithmetic

• Pointer automatically moves by sizeof(int)

 Difference: arr vs &arr

•  Interview-tricky concept

 Pointer vs Array (Important )

Arrays Passed to Functions (Always by Reference)

•  No array copy is made
•  Fast and memory efficient

 Pointer to Array vs Array of Pointers

 Pointer to Array

 Array of Pointers

•  Very common interview confusion

 Pointers with Multidimensional Arrays

•  Pointer must know column size

 Array of Pointers (Strings Example)

•  Used in command-line arguments

 Pointer Arithmetic Rules

•  Pointer + pointer (invalid)

 Common Mistakes

•  Confusing array with pointer
•  Using sizeof(pointer) instead of sizeof(array) 
•  Wrong pointer type for 2D arrays
•  Accessing out-of-bounds memory

 Interview Questions (Must Prepare)

1. Relationship between pointer and array

2. Difference between array and pointer

3. What is arr vs &arr?

4. How arrays are passed to functions?

5. Pointer to array vs array of pointers

6. 2D array pointer declaration

 Real-Life Use Cases

• Dynamic memory management

• String handling

• Data structures

• Embedded buffers

• Command-line arguments

 Summary

•  Array name acts as pointer
•  Pointer arithmetic enables fast access
•  Arrays passed by reference
•  2D arrays require correct pointer type
•  Extremely important for DSA & interviews