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Do you need to convert the lines into one long csv line or lines with 4 items. Be sure to test any solution you come up with with various inputs. Does it break with only 2 lines. Does it produce as comma at the end. What do you do about blank lines? Maybe the input file will have a trailing blank line. Maybe the last line won't end with a newline.
Guys, this is clearly homework. It does nothing good for the poster to give the answer, instead of guiding him/her to one. I was going to rant at those who broke this unofficial LQ rule, until I looked at the answers given. -- Unless I am mistaken, all are either in the wrong language (I hope deliberately), or broken.