Write a program, using a void function, that takes as input an integer and outputs two times the number if it is even; otherwise it outputs five times the number.  Then, using a void function, write a program that takes as input two integer values, say n and m. The function returns the sum and average of all the numbers between n and m (inclusive).

C++ for Engineers and Scientists
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Author:Bronson, Gary J.
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Chapter6: Modularity Using Functions
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C++ Programming problem:

Write a program, using a void function, that takes as input an integer and outputs two times the number if it is even; otherwise it outputs five times the number. 

Then, using a void function, write a program that takes as input two integer values, say n and m. The function returns the sum and average of all the numbers between n and m (inclusive).

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