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get out of the input section, the user is supposed to hit ctrl-z. this will then display all the averages
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This is ancient. And bad design as well. I'll explain.
CTRL^Z was needed in times when there was a switch from cp/m machines to dos. File input needed to terminate with ^z in those days. The ctrl^z mechanism was introduced in dos for compatibility with cp/m systems. It has to do with how files were stored those days: not in bytes, but in sectors. I've forgotten the details long time ago.
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get out of the input section
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There are tons of ways to deal wtih "menu" issues. Yet he manages (the teacher) to concentrate on a plain stupid method.
If you like it, I can build you some app that does ask for input and calculates the average. What is your current level or skill set?
What are the further requirements, if any?