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string manipulation

Posted on 2007-11-25
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Last Modified: 2010-04-15
hi,

i need to write a function in c# that get a string like that "hello world"
and returns the all letters combination for eich word in the input string , for example:
"holle wlord"
"ohlel world"
"leloh oldw"
exc..

thanks.
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Question by:bwz
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Göran Andersson earned 20 total points
ID: 20346935
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Expert Comment

by:Aurora27
ID: 20348187
just write a loop to replace each letter in the next position...and then loop for string's length
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Expert Comment

by:Aurora27
ID: 20348188
Is there a pattern required?

CT.
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Author Comment

by:bwz
ID: 20348518
there is a case for pattern , but i dont want it be to much complicated
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Expert Comment

by:Göran Andersson
ID: 20348630
Just split the string into words:

string word[] = input.Split(' ');

and get the permutations for each word.

Do you want the permuations for each word (i.e. for the example 120+120 combinations), or do you want all combinations of all permutations of all words (120*120 combinations)?
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Author Comment

by:bwz
ID: 20348639
i the combination for each word and not for all the letters in the string
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Expert Comment

by:Göran Andersson
ID: 20348734
Yes, but do you want the permuations for each word separately, or all combinations of all permuatations?

I.e. for "ab cde", do you want:

ab, ba
cde, ced, dce, dec, ecd, edc

or

ab cde
ab ced
ab dce
ab dec
ab ecd
ab edc
ba cde
ba ced
ba dce
ba dec
ba ecd
ba edc

For the first, just loop through the words and get the permuations. For the second you would create a list for each word that contains the permutations, then use an array of indexes to loop through all combinations.
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Expert Comment

by:Aurora27
ID: 20348738
Author, you need to be clear in your question. If thats a college assignment, then just post the question as is. we can look at it.

CT.
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Author Comment

by:bwz
ID: 20348809
greenGhost:
i mean to your second option.

Aurora27:
it's not by written task that i got.. it's a task that i should prepare ASAP

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