Why use Dynamic Memory Allocation
When working with arrays, we have always had to estimate the size we expect
the array to be. Many times we'll overestimate and waste a lot of space
since underestimating the size of an array is disastrous. Now we can actually
wait until the program is executing and ask the user how much space is needed
or get the size information from a file. This allows us to use exactly the
amount of space required.
Both malloc() and calloc() are used for dynamic memory allocation. You may
use whichever one you like best.
When using dynamic memory allocation, you must remember that you are now in
charge of the memory that you've allocated and when you are finished using it,
you should release it using the function free().
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