Wednesday, 26 May 2010

Dynamic Array

Dynamic array is an array that has no fix amount. To declare a dynamic array you can use this syntax :

Array of datatype;

Example :


       MyArray : array of integer;

This array is dynamic with integer data type. The memory of array is not allocated. To allocate memory of array use SetLength procedure.

Example :

    SetLength(MyArray, 5);

    SetLength(MyArray, 2, 3);

    SetLength(MyArray, 2, 3, 5);

It will allocate an array which has five elements. In this case the index will be 0, 1, 2, 3, 4. And to free the array memory, set nil value to the array. 

Example :

    MyArray := nil;

Example program :

program Project1;

   i, sum : integer;
   MyArray : array of integer;
  SetLength(MyArray, 5);
  MyArray[0] := 12;
  MyArray[1] := 14;
  MyArray[2] := 16;
  MyArray[3] := 18;
  MyArray[4] := 20;
  sum := 0;
  for i:= 0 to Length(MyArray) -1 do
     sum := sum + MyArray[i];

You can download the complete code here.


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