Write about Dynamic Arrays?

An arrays created at compile time by specifying size in the source code was a fixed size and cannot be modified at ran time.

The process of allocating memory at compile time is known as “static memory allocation” and the always that receive static memory allocation are called “static arrays”.

This approach works fine as long as we know exactly what our data requirements are.
Consider the situation where we want to use an array that can vary greatly in size. We must guess what will be the largest size ever needed and create the array accordingly.

In “C” it is possible to allocate memory to arrays at run time. This feature is known as ‘dynamic memory allocation” and the arrays created at run time are called “dynamic arrays”. This effectively postpones the array def to run time.

Dynamic arrays are created using what are known as pointer vars and memory management functions malloc, calloc and realloc.

These functions are included in the header file < stdlib.h>.

The concept of dynamic assays are used in creating and manipulating data structures such as linked lists , stacks and queues


malloc(): Allocates required size of bytes & return a pointer to  the first bytes of the allocated space.

Syntax: (int *) malloe (n * size of (int));

calloc(): Allocates space for an array of elements, initialize them to 0 and then returns a pointer  to the memory.

realloe():modifies the  space of previously allocated memory space.

free(): frees previously allocated space.

Related

C Language 7703865142101565327

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