What is the difference between Dim And Redim
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Answer Posted / deepa
Dim Statement
Declares variables and allocates storage space.
Dim varname[([subscripts])][, varname[([subscripts])]] . . .
Variables declared with Dim at the script level are
available to all procedures within the script. At the
procedure level, variables are available only within the
procedure.
You can also use the Dim statement with empty parentheses
to declare a dynamic array. After declaring a dynamic
array, use the ReDim statement within a procedure to define
the number of dimensions and elements in the array. If you
try to redeclare a dimension for an array variable whose
size was explicitly specified in a Dim statement, an error
occurs.
ReDim Statement
Declares dynamic-array variables, and allocates or
reallocates storage space at procedure level.
ReDim [Preserve] varname(subscripts) [, varname
(subscripts)] . . .
The ReDim statement is used to size or resize a dynamic
array that has already been formally declared using a
Private, Public, or Dim statement with empty parentheses
(without dimension subscripts). You can use the ReDim
statement repeatedly to change the number of elements and
dimensions in an array.
If you use the Preserve keyword, you can resize only the
last array dimension, and you can't change the number of
dimensions at all. For example, if your array has only one
dimension, you can resize that dimension because it is the
last and only dimension. However, if your array has two or
more dimensions, you can change the size of only the last
dimension and still preserve the contents of the array.
The following example shows how you can increase the size
of the last dimension of a dynamic array without erasing
any existing data contained in the array.
ReDim X(10, 10, 10)
. . .
ReDim Preserve X(10, 10, 15)
Caution If you make an array smaller than it was
originally, data in the eliminated elements is lost.
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