cpp/memory/c/calloc

Allocates memory for an array of objects of size, initializes it to all bits zero (implicitly creating objects in the destination area).

If allocation succeeds, returns a pointer to the lowest (first) byte in the allocated memory block that is suitably aligned for any object type.

If is zero, the behavior is implementation defined (null pointer may be returned, or some non-null pointer may be returned that may not be used to access storage).

Return value
On success, returns the pointer to the beginning of newly allocated memory. To avoid a memory leak, the returned pointer must be deallocated with std or std.

On failure, returns a null pointer.