Work with file

This is my 1 post on your forum and I hope that is not the last, if you find errors in my speech, I'm sorry.

I study in a foreign university, given homework, which my friends and I can not handle, I do omega yet, given the task of writing here is a code translated into English, perhaps with mistakes, but as it is, in C++ ofc)
Alrighty, then.
I have to hand over homework, but I do not know how to do it.So I wrote here, that's the problem itself:

The task of the day: Create a program that opens the file, displays its contents, add each number from the file. (to date to evaluate 3) displayed at a given character in the file (which will ask which character I want to see) (4) will add text to a file and save it.
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