The scratchpad variable "d" must be able to hold the result of a single-digit multiply "plus the carry" from the prior digit's multiply.
It is similar to the usage and size of a scratchpad in life: a pad of paper for preliminary notes or sketches or writings, etc.
It derives from the intuition of memory as a scratchpad.
Working memory is similar to a mental scratchpad, facilitating the manipulation of information held in consciousness.
An application-wide scratchpad (which can be used as a color mixing panel) is provided, which is saved between sessions.
Many apps can be used inside the hangout, allowing users to share documents, a scratchpad or their screens with other users.
