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help needed in I/O  RSS feed

Himal Chuli
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Hi All,
I am not very good at I/O stuffs. i have a situation like this. I have a file already existed. now i would like to write a program that asks a file name and reads that file. also, I need to pause after 2o characters are read and when i press Enter key, it reads again 20 characters and like that. how do i do this? would greatly appreciate if anyone could transfer me this kind of knowledge. thanks.
Don't get me started about those stupid light bulbs.
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