### The Snail And The Well

*At this pace, how many days and nights will it take the snail to reach the top of the well?*

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DATA FLOW DIAGRAM Data Flow Diagram (DFD) describes the system distribution into a smaller system. DFD allows the user to easily learn about computer and understand about worked system. DFD allows to learn new system are logically develop without consider the physically environment where the data flow (like by phone, mail, etc) or physically environment where the will be save (like file card, microfiche, hard disk, tape, diskette, etc). DFD is a tool used in methodology structured Analysis and design. CONTEXT DIAGRAM Context Diagram consists of one process to describe the system environment. It’s a highest level in DFD which is describes all the input into the system and output from system. System has a boundary which is to separate the system with the external entity. In context diagram there is no storage. Because context diagram are process to describe the system environment. ZERO DIAGRAMS Zero diagrams are describes the process of DFD. It gives a opi

After traveling 3 feet up, then sliding 2 feet down, the snail had a net gain of 1 foot per day and night. One would think, 1 foot per day and night, 30 foot deep well, 30 days and nights! But that's wrong.

ReplyDeleteAfter 26 days and nights, the snail is 26 feet up the well. So the snail starts the 27th day at 26 feet. At the end of the 27th day, the snail has travelled to 29 feet, but during the 27th night, it slides down to 27 feet. So, on the 28th day, the snail travels 3 feet up and reaches the top of the well.

So, the final answer is 28 days and 27 nights.