C Access Memory

1. Accessing Memory Using Pointers

• A pointer stores the address of a variable.

• Use dereferencing (*) to access or modify the value at that memory address.

Syntax:

2. Example: Pointer Access

Output:

*ptr accesses the memory location of a.

3. Accessing Dynamically Allocated Memory

• After allocating memory with malloc or calloc, use pointer arithmetic or dereferencing to access elements.

Output:

Array notation arr[i] is equivalent to *(arr + i).

4. Accessing Memory in Structures via Pointers

Output:

Use -> operator to access struct members via pointer.

5. Pointer Arithmetic for Memory Access

• Pointers can be incremented or decremented to traverse memory:

Output:

6. Key Points About Accessing Memory in C

1. Pointers store addresses of variables or allocated memory.

2. Use *ptr to read/write the value at that memory location.

3. Array elements can be accessed using array notation (arr[i]) or pointer arithmetic (*(arr + i)).

4. For structures, use dot . for normal variables and arrow -> for pointers.

5. Always ensure the pointer points to valid memory before accessing it.