c program to find sum of array elements using dynamic memory allocation

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## C Program to Find the Sum of Array Elements Using Dynamic Memory Allocation

This tutorial will guide you through creating a C program that calculates the sum of array elements using dynamic memory allocation. Dynamic memory allocation allows you to allocate memory during runtime, which is particularly useful when you don't know the size of the array in advance.

**1. Understanding Dynamic Memory Allocation:**

In C, dynamic memory allocation involves reserving memory space from the heap (a section of memory available for dynamic use) at runtime. This is in contrast to static memory allocation, where memory is allocated at compile time.

**Why Use Dynamic Memory Allocation?**

* **Flexibility:** You can allocate memory based on user input or runtime conditions.
* **Efficiency:** You only allocate the memory you need, avoiding wasting memory.
* **Handling Large Arrays:** You can create arrays larger than the stack's size limit.

**Key Functions for Dynamic Memory Allocation:**

C provides several functions for dynamic memory management:

* `malloc()`: Allocates a block of memory of a specified size. It returns a pointer to the beginning of the allocated block. If the allocation fails, it returns `NULL`.
* `calloc()`: Allocates a block of memory for an array of elements, initializing all bytes to zero. It returns a pointer to the beginning of the allocated block. If the allocation fails, it returns `NULL`.
* `realloc()`: Resizes a previously allocated block of memory. It returns a pointer to the beginning of the resized block (which might be a different address than the original). If the resizing fails, it returns `NULL`.
* `free()`: Releases a previously allocated block of memory, making it available for future allocation. **It is crucial to `free()` memory when you are finished with it to prevent memory leaks.**

**2. Program Overview:**

Our program will do the following:

1. **Get the Array Size:** Prompt the user to enter the number of ele ...

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