Dynamic Memory Allocation Function

Dynamic Allocation Function are used to allocate space or memory dynamically or at run time. The header file used by the dynamic allocation functions is "<cstdlib>".
Different C++ compilers support these functions in different variants, to accommodate various options and environmental differences. Following table lists some basic dynamic memory allocation function to allocate space.

Name	Description
calloc	Allocates memory of the specified size
free	Returns the memory pointed by the pointer.
malloc	Returns a pointer to the first byte of the memory.
realloc	Changes the size of the previously allocated.