Dynamic array in C

Question

Is there any method for creating a dynamic array in C

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you can use arraylist object from collections class using System Collections   static void Main       ArrayList arr   new ArrayList       when you want to add elements you can use arr Add

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Sometimes plain arrays are preferred to Generic Lists  since they are more convenient  Better performance for costly computation -Numerical Algebra Applications for example  or for exchanging Data with Statistics software like R or Matlab    In this case you may use the ToArray   method after initiating your List dynamically   List lt string gt  list   new List lt string gt     list Add  one    list Add  two    list Add  three     string   array   list ToArray      Of course  this has sense only if the size of the array is never known nor fixed ex-ante  if you already know the size of your array at some point of the program it is better to initiate it as a fixed length array   If you retrieve data from a ResultSet for example  you could count its size and initiate an array of that size  dynamically

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Use the array list which is actually implement array  It takes initially array of size 4 and when it gets full  a new array is created with its double size and the data of first array get copied into second array  now the new item is inserted into new array   Also the name of second array creates an alias of first so that it can be accessed by the same name as previous and the first array gets disposed

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This answer seems to be the answer you are looking for Why can  39 t I do this  dynamic x   new ExpandoObject   Foo   12  Bar    quot twelve quot     Read about the ExpandoObject here https   msdn microsoft com en-us library system dynamic expandoobject v vs 110  aspx  And the dynamic type here https   msdn microsoft com en-GB library dd264736 aspx

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Expanding on Chris and Migol s answer with a code sample     Using an array  Student   array   new Student 2   array 0    new Student  bob    array 1    new Student  joe      Using a generic list   Under the hood the List lt T gt  class uses an array for storage but does so in a fashion that allows it to grow effeciently     List lt Student gt  list   new List lt Student gt     list Add new Student  bob     list Add new Student  joe     Student joe   list 1

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Dynamic Array Example   Console WriteLine  Define Array Size      int number   Convert ToInt32 Console ReadLine      Console WriteLine  Enter numbers  n    int   arr   new int number    for  int i   0  i  lt  number  i          arr i    Convert ToInt32 Console ReadLine       for  int i   0  i  lt  arr Length  i           Console WriteLine  Array Index    i     AND Array Item      arr i  ToString       Console ReadKey

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You can do this with dynamic objects   var dynamicKeyValueArray   new     new  Key    K1   Value   10   new  Key    K2   Value   5      foreach var keyvalue in dynamicKeyValueArray        Console Log keyvalue Key       Console Log keyvalue Value

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List lt T gt  for strongly typed one  or ArrayList if you have  NET 1 1 or love to cast variables

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Take a look at Generic Lists

[c#] Dynamic array in C#

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