Array Size Length in C

Question

How can I determine size of an array  length   number of items  in C

User · Answer

for 1 dimensional array  int   listItems   new int    2 4 8   int length   listItems Length    for multidimensional array  int length   listItems Rank    To get the size of 1 dimension  int length    listItems GetLength 0

User · Answer

it goes like this  1D    type   name new type size     or  new type        elements       2D    type    name new type size      second brackets are emtpy   then as you use this array     name i  new type size of sec Dim    or You can declare something like a  matrix  type      name new type  size1 size2

User · Answer

If it s a one-dimensional array a   a Length   will give the number of elements of a   If b is a rectangular multi-dimensional array  for example  int    b   new int 3  5     b Rank   will give the number of dimensions  2  and  b GetLength dimensionIndex    will get the length of any given dimension  0-based indexing for the dimensions - so b GetLength 0  is 3 and b GetLength 1  is 5    See System Array documentation for more info   As  Lucero points out in the comments  there is a concept of a  jagged array   which is really nothing more than a single-dimensional array of  typically single-dimensional  arrays    For example  one could have the following   int     c   new int 3     c 0    new int    1  2  3   c 1    new int    3  14   c 2    new int    1  1  2  3  5  8  13     Note that the 3 members of c all have different lengths  In this case  as before c Length will indicate the number of elements of c   3  and c 0  Length  c 1  Length  and c 2  Length will be 3  2  and 7  respectively

User · Answer

What has been missed so far is what I suddenly was irritated about   How do I know the amount of items inside the array  Is  Length equal  Count of a List   The answer is  the amount of items of type X which have been put into an array of type X created with new X number  you have to carry yourself   Eg  using a counter  int countItemsInArray   0 and countItemsInArray   for every assignment to your array    The array just created with new X number  has all space for number items  references  of type X already allocated  you can assign to any place inside as your first assignment  for example  if number   100 and the variable name   a  a 50    new X      I don t know whether C  specifies the initial value of each place inside an array upon creation  if it doesn t or the initial value you cannot compare to  because it might be a value you yourself have put into the array   you would have to track which places inside the array you already assigned to too if you don t assign sequentially starting from 0  in which case all places smaller than countItemsInArray would be assigned to     In your question size of an array  length   number of items  depending on whether   is meant to stand for  alternative  or  divide by  the latter still has to be covered  the  number of items  I just gave as  amount of items  and others gave  Length which corresponds to the value of number in my code above    C  has a sizeof operator  https   docs microsoft com en-us dotnet csharp language-reference operators sizeof   It s safe to use for built-in types  such as int   and only operates on types  not variables    Thus the size of an array b of type int in bytes would be b Length   sizeof int     Due to all space of an array already being allocated on creation  like mentioned above  and sizeof only working on types  no code like sizeof variable  sizeof type  would work or yield the amount of items without tracking

User · Answer

For a single dimension array  you use the Length property   int size   theArray Length    For multiple dimension arrays the Length property returns the total number of items in the array  You can use the GetLength method to get the size of one of the dimensions   int size0   theArray GetLength 0

User · Answer

yourArray Length

User · Answer

With the Length property   int   foo   new int 10   int n   foo Length     n    10

User · Answer

In most of the general cases  Length  and  Count  are used   Array    int   myArray   new int size   int noOfElements   myArray Length    Typed List Array   List  lt int gt  myArray   new List lt int gt     int noOfElements   myArray Count

User · Answer

You can look at the documentation for Array to find out the answer to this question   In this particular case you probably need Length   int sizeOfArray   array Length    But since this is such a basic question and you no doubt have many more like this  rather than just telling you the answer I d rather tell you how to find the answer yourself   Visual Studio Intellisense  When you type the name of a variable and press the   key it shows you a list of all the methods  properties  events  etc  available on that object  When you highlight a member it gives you a brief description of what it does     Press F1  If you find a method or property that might do what you want but you re not sure  you can move the cursor over it and press F1 to get help  Here you get a much more detailed description plus links to related information   Search  The search terms size of array in C  gives many links that tells you the answer to your question and much more  One of the most important skills a programmer must learn is how to find information  It is often faster to find the answer yourself  especially if the same question has been asked before   Use a tutorial  If you are just beginning to learn C  you will find it easier to follow a tutorial  I can recommend the C  tutorials on MSDN  If you want a book  I d recommend Essential C    Stack Overflow  If you re not able to find the answer on your own  please feel free to post the question on Stack Overflow  But we appreciate it if you show that you have taken the effort to find the answer yourself first

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