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Thank you Patrick,but it kinda difficult for me to understand your code as I am new to prolog.Can you help me with my approach. I was thinking to convert each line into lists(I don't know how)and then use this [_ , _ , _ , X|tail]to get 4th word.Can you tell me how to convert each line to list and whether my approach is good?

user4067810
– user4067810

2014-09-23 06:09:13 +00:00
Commented Sep 23, 2014 at 6:09
2

@noobcoder: yes, you can use [_,_,_,Word|_] = ListOfWords to pick out the 4th element from a list.

jschimpf
– jschimpf

2014-09-23 09:20:57 +00:00
Commented Sep 23, 2014 at 9:20
@noobcoder: If you want to use built-in predicates, look at jschimpf's answer. I'll expand this a bit to make it more clear.

Patrick J. S.
– Patrick J. S.

2014-09-23 13:25:51 +00:00
Commented Sep 23, 2014 at 13:25

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