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plurals

POC#: the top efficiency in converting an int[] into a string
primarykey
Id
13443011
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0
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ClosedDate
CommentCount
9
CommunityOwnedDate
CreationDate
2012-11-18T18:11:10.733
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2012-11-19T09:48:01.083
LastEditDate
2017-05-23T11:48:55.217
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Body
I'm posting a new thread since the last one was very confused and the idea has been modified as well. I changed the program in many places, not losing efficiency (even gaining a bit) and now I have a simple array of integers as before, no separators needed. <a href="https://stackoverflow.com/questions/13440323/c-the-most-efficient-way-to-convert-int-into-a-string">Previous thread for the reference</a> I do know that this kind of questions have already been answered many times. Although I've found lots of possible answers, they still don't solve my problem, which is to implement the fastest possible way to convert an integer array into a single string. All right then, <pre><code>int[] Result = new int[] { 636, 1000234545, 1353678530, 987001 } </code></pre> I should get: <pre><code>636000234545353678530987001 </code></pre> Notice that I have taken only the last 9 digits of each element. Here's corrected version of Honza Brestan: <pre><code>StringBuilder sb = new StringBuilder(); for (var i = 0; i < xC; i++) { tempint = Result[i]; if (tempint > 999999999) sb.Append((Result[i]).ToString().Substring(1, 9)); else sb.Append((Result[i]).ToString()); } return sb.ToString(); </code></pre> And my, old, corrected: <pre><code>//Base – a string array of integers saved as strings {“000”, “001”, … , “999” } string[] arr = new string[3 * limit]; int x; // temp value for (int i = 0; i < limit; i++) { x = Result[i]; if (x > 999999) { arr [3 * i + 2] = Base [x % 1000]; arr [3 * i + 1] = Base [x / 1000 % 1000]; arr [3 * i] = Base [x / 1000000 % 1000]; } else { if (x < 1000) { arr [3 * i + 2] = Base [x % 1000]; } else { arr [3 * i] = Base [x / 1000 % 1000]; arr [3 * i + 1] = Base [x % 1000]; } } } return string.Join(null, arr); </code></pre> And now difference in speed: Honza: 689 ms My: 331 ms Any ideas how to improve the speed? Maybe use assembler?
Tags
<c#><performance><optimization>
Title
C#: the top efficiency in converting an int[] into a string
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USRandolph
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PostLinksPostIdRelatedPostId
1. PL
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 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
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1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PostTypePostTypeId
 PTAnswer
2. PO
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 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
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 POC#: the top efficiency in converting an int[] into a string
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 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTDownMod
2. VO
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 POC#: the top efficiency in converting an int[] into a string
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 This table or related slice is empty.
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 VTModeratorReview
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