Three functions +main

Hello!!!

I have to write 3 functions!
First from a makes 3a.

Second frm b makes b-4.


Third from c makes 5c+4

The point is that I have to write cinn and cout only in main!!!

Please, any ideas?
(maybe arrays but how?)

Many thanks!

Your question is unclear? What do you mean by 'make'? Do you want to calculate values and print them?

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