Interacting with other files

[Cancer Sol]

I wanted to do this question: http://dwite.org/questions/candy_piles.html
But I don't even know how to have the program interact with the text file, for example, look at what numbers are in DATA1.txt.
How do I have the program look at the content of the text file?

[Insectoid]

http://www.cplusplus.com/doc/tutorial/files/

[Cancer Sol]

Insectoid @ 4/23/2013, 6:59 pm wrote:

http://www.cplusplus.com/doc/tutorial/files/

Thanks!
I tried searching so many different things on google but the way I phrased it was incorrect I think.
That was what I was trying to find the whole time
Again, thanks a lot!