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You could supply a value for mode via a command-line argument. It
is more likely, however, that you want to vary the speed-versus-accuracy
tradeoff of your program as it is running, especially if your program is in
an endlessly repeating loop of the sort you saw in
Segment 573. Each time through the loop, you could ask the
program user to supply a value for mode via the keyboard.
Alternatively, you could use functions found in C's time library to keep
track of how fast your program is handling files, switching from accurate
to fast computing if necessary to keep up with changing information.