Best way to repeat a character in C

Question

What it s the best way to generate a string of  t s in C   I am learning C  and experimenting with different ways of saying the same thing     Tabs uint t  is a function that returns a string with t amount of  t s  For example Tabs 3  returns   t t t   Which of these three ways of implementing Tabs uint numTabs  is best   Of course that depends on what  best  means      The LINQ version is only two lines  which is nice   But are the calls to Repeat and Aggregate unnecessarily time resource consuming  The StringBuilder version is very clear but is the StringBuilder class somehow slower  The string version is basic  which means it is easy to understand    Does it not matter at all   Are they all equal    These are all questions to help me get a better feel for C       private string Tabs uint numTabs        IEnumerable lt string gt  tabs   Enumerable Repeat   t    int  numTabs       return  numTabs  gt  0    tabs Aggregate  sum  next    gt  sum   next              private string Tabs uint numTabs        StringBuilder sb   new StringBuilder        for  uint i   0  i  lt  numTabs  i            sb Append   t         return sb ToString         private string Tabs uint numTabs        string output           for  uint i   0  i  lt  numTabs  i                  output      t             return output

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string Concat Enumerable Repeat  ab   2      Returns      abab    And  string Concat Enumerable Repeat  a   2      Returns      aa    from     Is there a built-in function to repeat string or char in  net

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You can create an extension method  static class MyExtensions       internal static string Repeat this char c  int n                return new string c  n             Then you can use it like this  Console WriteLine   t  Repeat 10

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What about this   string tabs   new String   t   n     Where n is the number of times you want to repeat the string   Or better   static string Tabs int n        return new String   t   n

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The best version is certainly to use the builtin way   string Tabs int len    return new string   t   len       Of the other solutions  prefer the easiest  only if this is proving too slow  strive for a more efficient solution   If you use a StringBuilder and know its resulting length in advance  then also use an appropriate constructor  this is much more efficient because it means that only one time-consuming allocation takes place  and no unnecessary copying of data  Nonsense  of course the above code is more efficient

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You can create an extension method  static class MyExtensions       internal static string Repeat this char c  int n                return new string c  n             Then you can use it like this  Console WriteLine   t  Repeat 10

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Let s say you want to repeat   t  n number of times  you can use   String Empty PadRight n   t

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For me is fine   public static class Utils       public static string LeftZerosFormatter int zeros  int val                string valstr   val ToString             valstr   new string  0   zeros    valstr           return valstr Substring valstr Length - zeros  zeros

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What about this   string tabs   new String   t   n     Where n is the number of times you want to repeat the string   Or better   static string Tabs int n        return new String   t   n

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What about this   string tabs   new String   t   n     Where n is the number of times you want to repeat the string   Or better   static string Tabs int n        return new String   t   n

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And yet another method   new System Text StringBuilder   Append   t   100  ToString

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The best version is certainly to use the builtin way   string Tabs int len    return new string   t   len       Of the other solutions  prefer the easiest  only if this is proving too slow  strive for a more efficient solution   If you use a StringBuilder and know its resulting length in advance  then also use an appropriate constructor  this is much more efficient because it means that only one time-consuming allocation takes place  and no unnecessary copying of data  Nonsense  of course the above code is more efficient

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Fill the screen with 6 435 z s  str    System Linq Enumerable   Repeat  string   new  quot z quot   143   45   str

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The answer really depends on the complexity you want  For example  I want to outline all my indents with a vertical bar  so my indent string is determined as follows   return new string Enumerable Range 0  indentSize indent  Select    n   gt  n 4    0              ToArray

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Extension methods           public static string Repeat this string s  int n        return new String Enumerable Range 0  n  SelectMany x   gt  s  ToArray        public static string Repeat this char c  int n        return new String c  n

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Your first example which uses Enumerable Repeat   private string Tabs uint numTabs        IEnumerable lt string gt  tabs   Enumerable Repeat                                     t    int  numTabs       return  numTabs  gt  0                 tabs Aggregate  sum  next    gt  sum   next              can be rewritten more compactly with String Concat   private string Tabs uint numTabs               return String Concat Enumerable Repeat   t    int  numTabs

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Without a doubt the accepted answer is the best and fastest way to repeat a single character   Binoj Anthony s answer is a simple and quite efficient way to repeat a string   However  if you don t mind a little more code  you can use my array fill technique to efficiently create these strings even faster   In my comparison tests  the code below executed in about 35  of the time of the StringBuilder Insert code    public static string Repeat this string value  int count        var values   new char count   value Length       values Fill value ToCharArray         return new string values      public static void Fill lt T gt  this T   destinationArray  params T   value        if  destinationArray    null                throw new ArgumentNullException  destinationArray               if  value Length  gt  destinationArray Length                throw new ArgumentException  Length of value array must not be more than length of destination                  set the initial array value     Array Copy value  destinationArray  value Length        int copyLength  nextCopyLength       for  copyLength   value Length   nextCopyLength   copyLength  lt  lt  1   lt  destinationArray Length  copyLength   nextCopyLength                Array Copy destinationArray  0  destinationArray  copyLength  copyLength              Array Copy destinationArray  0  destinationArray  copyLength  destinationArray Length - copyLength       For more about this array fill technique  see Fastest way to fill an array with a single value

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string Concat Enumerable Repeat  ab   2      Returns      abab    And  string Concat Enumerable Repeat  a   2      Returns      aa    from     Is there a built-in function to repeat string or char in  net

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Extension methods           public static string Repeat this string s  int n        return new String Enumerable Range 0  n  SelectMany x   gt  s  ToArray        public static string Repeat this char c  int n        return new String c  n

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Without a doubt the accepted answer is the best and fastest way to repeat a single character   Binoj Anthony s answer is a simple and quite efficient way to repeat a string   However  if you don t mind a little more code  you can use my array fill technique to efficiently create these strings even faster   In my comparison tests  the code below executed in about 35  of the time of the StringBuilder Insert code    public static string Repeat this string value  int count        var values   new char count   value Length       values Fill value ToCharArray         return new string values      public static void Fill lt T gt  this T   destinationArray  params T   value        if  destinationArray    null                throw new ArgumentNullException  destinationArray               if  value Length  gt  destinationArray Length                throw new ArgumentException  Length of value array must not be more than length of destination                  set the initial array value     Array Copy value  destinationArray  value Length        int copyLength  nextCopyLength       for  copyLength   value Length   nextCopyLength   copyLength  lt  lt  1   lt  destinationArray Length  copyLength   nextCopyLength                Array Copy destinationArray  0  destinationArray  copyLength  copyLength              Array Copy destinationArray  0  destinationArray  copyLength  destinationArray Length - copyLength       For more about this array fill technique  see Fastest way to fill an array with a single value

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Albeit very similar to a previous suggestion  I like to keep it simple and apply the following   string MyFancyString        int strLength   50  System Console WriteLine MyFancyString PadRight strLength          Standard  Net really

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Using String Concat and Enumerable Repeat which will be less expensive than using String Join  public static Repeat this String pattern  int count        return String Concat Enumerable Repeat pattern  count

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I know that this question is five years old already but there is a simple way to repeat a string that even works in  Net 2 0   To repeat a string   string repeated   new String      3  Replace       Hello        Returns      Hello  Hello  Hello      To repeat a string as an array      Two line version  string repeated   new String      3  Replace       Hello     string   repeatedArray   repeated Split           One line version  string   repeatedArray   new String      3  Replace       Hello    Split         Returns       Hello    Hello    Hello         Keep it simple

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What about using extension method       public static class StringExtensions      public static string Repeat this char chatToRepeat  int repeat            return new string chatToRepeat repeat           public  static string Repeat this string stringToRepeat int repeat              var builder   new StringBuilder repeat stringToRepeat Length          for  int i   0  i  lt  repeat  i                 builder Append stringToRepeat                   return builder ToString               You could then write       Debug WriteLine  -  Repeat 100       For Chars   Debug WriteLine  Hello  Repeat 100       For Strings   Note that a performance test of using the stringbuilder version for simple characters instead of strings gives you a major preformance penality    on my computer the difference in mesured performance  is 1 20 between  Debug WriteLine  -  Repeat 1000000     char version  and Debug WriteLine  -  Repeat 1000000     string version

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The answer really depends on the complexity you want  For example  I want to outline all my indents with a vertical bar  so my indent string is determined as follows   return new string Enumerable Range 0  indentSize indent  Select    n   gt  n 4    0              ToArray

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What about using extension method       public static class StringExtensions      public static string Repeat this char chatToRepeat  int repeat            return new string chatToRepeat repeat           public  static string Repeat this string stringToRepeat int repeat              var builder   new StringBuilder repeat stringToRepeat Length          for  int i   0  i  lt  repeat  i                 builder Append stringToRepeat                   return builder ToString               You could then write       Debug WriteLine  -  Repeat 100       For Chars   Debug WriteLine  Hello  Repeat 100       For Strings   Note that a performance test of using the stringbuilder version for simple characters instead of strings gives you a major preformance penality    on my computer the difference in mesured performance  is 1 20 between  Debug WriteLine  -  Repeat 1000000     char version  and Debug WriteLine  -  Repeat 1000000     string version

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The best version is certainly to use the builtin way   string Tabs int len    return new string   t   len       Of the other solutions  prefer the easiest  only if this is proving too slow  strive for a more efficient solution   If you use a StringBuilder and know its resulting length in advance  then also use an appropriate constructor  this is much more efficient because it means that only one time-consuming allocation takes place  and no unnecessary copying of data  Nonsense  of course the above code is more efficient

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And yet another method   new System Text StringBuilder   Append   t   100  ToString

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var str   new string Enumerable Repeat   t   numTabs  ToArray

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Let s say you want to repeat   t  n number of times  you can use   String Empty PadRight n   t

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What about using extension method       public static class StringExtensions      public static string Repeat this char chatToRepeat  int repeat            return new string chatToRepeat repeat           public  static string Repeat this string stringToRepeat int repeat              var builder   new StringBuilder repeat stringToRepeat Length          for  int i   0  i  lt  repeat  i                 builder Append stringToRepeat                   return builder ToString               You could then write       Debug WriteLine  -  Repeat 100       For Chars   Debug WriteLine  Hello  Repeat 100       For Strings   Note that a performance test of using the stringbuilder version for simple characters instead of strings gives you a major preformance penality    on my computer the difference in mesured performance  is 1 20 between  Debug WriteLine  -  Repeat 1000000     char version  and Debug WriteLine  -  Repeat 1000000     string version

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Using String Concat and Enumerable Repeat which will be less expensive than using String Join  public static Repeat this String pattern  int count        return String Concat Enumerable Repeat pattern  count

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The best version is certainly to use the builtin way   string Tabs int len    return new string   t   len       Of the other solutions  prefer the easiest  only if this is proving too slow  strive for a more efficient solution   If you use a StringBuilder and know its resulting length in advance  then also use an appropriate constructor  this is much more efficient because it means that only one time-consuming allocation takes place  and no unnecessary copying of data  Nonsense  of course the above code is more efficient

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I know that this question is five years old already but there is a simple way to repeat a string that even works in  Net 2 0   To repeat a string   string repeated   new String      3  Replace       Hello        Returns      Hello  Hello  Hello      To repeat a string as an array      Two line version  string repeated   new String      3  Replace       Hello     string   repeatedArray   repeated Split           One line version  string   repeatedArray   new String      3  Replace       Hello    Split         Returns       Hello    Hello    Hello         Keep it simple

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Your first example which uses Enumerable Repeat   private string Tabs uint numTabs        IEnumerable lt string gt  tabs   Enumerable Repeat                                     t    int  numTabs       return  numTabs  gt  0                 tabs Aggregate  sum  next    gt  sum   next              can be rewritten more compactly with String Concat   private string Tabs uint numTabs               return String Concat Enumerable Repeat   t    int  numTabs

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var str   new string Enumerable Repeat   t   numTabs  ToArray

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What about using extension method       public static class StringExtensions      public static string Repeat this char chatToRepeat  int repeat            return new string chatToRepeat repeat           public  static string Repeat this string stringToRepeat int repeat              var builder   new StringBuilder repeat stringToRepeat Length          for  int i   0  i  lt  repeat  i                 builder Append stringToRepeat                   return builder ToString               You could then write       Debug WriteLine  -  Repeat 100       For Chars   Debug WriteLine  Hello  Repeat 100       For Strings   Note that a performance test of using the stringbuilder version for simple characters instead of strings gives you a major preformance penality    on my computer the difference in mesured performance  is 1 20 between  Debug WriteLine  -  Repeat 1000000     char version  and Debug WriteLine  -  Repeat 1000000     string version

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In all versions of  NET  you can repeat a string thus   public static string Repeat string value  int count        return new StringBuilder value Length   count  Insert 0  value  count  ToString        To repeat a character  new String   t   count  is your best bet  See the answer by  CMS

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Fill the screen with 6 435 z s  str    System Linq Enumerable   Repeat  string   new  quot z quot   143   45   str

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Try this    Add Microsoft VisualBasic reference Use  String result   Microsoft VisualBasic Strings StrDup 5  hi    Let me know if it works for you

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How about this     Repeats a character specified number of times public static string Repeat char character int numberOfIterations        return    PadLeft numberOfIterations  character        Call the Repeat method Console WriteLine Repeat   t  40

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What about this   string tabs   new String   t   n     Where n is the number of times you want to repeat the string   Or better   static string Tabs int n        return new String   t   n

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For me is fine   public static class Utils       public static string LeftZerosFormatter int zeros  int val                string valstr   val ToString             valstr   new string  0   zeros    valstr           return valstr Substring valstr Length - zeros  zeros

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Try this    Add Microsoft VisualBasic reference Use  String result   Microsoft VisualBasic Strings StrDup 5  hi    Let me know if it works for you

User · Answer

Albeit very similar to a previous suggestion  I like to keep it simple and apply the following   string MyFancyString        int strLength   50  System Console WriteLine MyFancyString PadRight strLength          Standard  Net really

User · Answer

How about this     Repeats a character specified number of times public static string Repeat char character int numberOfIterations        return    PadLeft numberOfIterations  character        Call the Repeat method Console WriteLine Repeat   t  40

User · Answer

In all versions of  NET  you can repeat a string thus   public static string Repeat string value  int count        return new StringBuilder value Length   count  Insert 0  value  count  ToString        To repeat a character  new String   t   count  is your best bet  See the answer by  CMS

[c#] Best way to repeat a character in C#

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