There are tons of possiblities to have counters depending on how do you access it and where does it keep the score. In this exercise you are required to implement a number of different counters. A few ideas follow:
A command-line single-counter. Every time we run the program it will display an ever increasing number:
$ counter 1 $ counter 2 $ counter 3
A command-line multi-counter:
$ counter Foo 1 $ counter Foo 2 $ counter Bar 1 $ counter Foo 3 $ counter Foo 4 $ counter Bar 2
Front-ends:
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Command line
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Web browser
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GUI (e.g. Python Tk)
You can find many solutions in the Counter Examples project.
