Flow charts are a diagrammatic representation of a set of
instructions which must be followed. Flow charts are made up of
different boxes, which each have different functions. The flow
chart above says think of a number, add 5 and multiply by 2. If
the number is negative, make it positive. Flow charts are
usually equivalent to some function. In the example above, the
flow chart is equivalent to the function f(x) = | 2(x + 5) | .
(the vertical lines around 2(x + 5) means take the magnitude of
the answer). © Matthew Pinkney