| Author |
Message |
< Erlang ~ comparing substrings |
| badlucky |
 Posted: Wed Jan 06, 2010 2:17 am |
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Joined: 05 Jan 2010
Posts: 1
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so im new to erlang and here is what i have so far...
-module(abc).
-export([main/0,findMatch/1]).
main()->
findMatch("abcabcabc").
findMatch(word)->
sub_string(word,1,3)->p1;
sub_string(word,4,6)->p2;
sub_string(word,7,9)->p3;
if p1 == p2 == p3 -> true.
im trying to take 9 letters as one string and break it up into three parts seeing if all three are identical, if so then true, else its false
how can i compare the substrings/ what am i missing to get this to at least compile?? |
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| Allan |
| Posted: Wed Jan 06, 2010 12:57 pm |
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User
Joined: 29 Jun 2009
Posts: 30
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badlucky wrote: what am i missing to get this to at least compile??
You have to define sub_string/3 somewhere and/or prefix the calls with the name of the module containing the function declaration.
Multiple expressions have to be separated by comma in a function body.
Expression results are assigned to variables by first writing the variable's name, followed by an equal sign and the expression.
Variable names begin always with an uppercase letter.
Try something like this:
Code: -module(abc).
-export([main/0, findMatch/1]).
main()-> findMatch("abcabcabc").
findMatch(Word)->
P1 = string:substr(Word, 1, 3),
P2 = string:substr(Word, 4, 3),
P3 = string:substr(Word, 7, 3),
(P1 =:= P2) andalso (P2 =:= P3)
.
Other people interested in Erlang Syntax were interested in Sequential Programming in the Erlang documentation too. |
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| Sergio Salvato |
| Posted: Thu Jan 07, 2010 4:32 pm |
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Joined: 07 Sep 2009
Posts: 2
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Or something like this:
Code:
-module(abc).
-export([main/0, findMatch/1]).
main()-> findMatch("abcabcabc").
findMatch([A, B, C, A, B, C, A, B, C])-> true;
findMatch(_) -> false.
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| wuji |
| Posted: Fri Sep 14, 2012 6:50 am |
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Joined: 10 Aug 2012
Posts: 654
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| dongdongwu |
| Posted: Wed Sep 19, 2012 7:49 am |
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Joined: 19 Sep 2012
Posts: 236
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