programming-for-dummies

320
Working with Resizable Arrays
Dim BigArray(5) as String
Figure 1-6:
Resizing an
array lets
you expand
or shrink an
array.
0 1
2
Jan Howards Mike Edwards John Perkins
0 1 2
Jan Howards Mike Edwards John Perkins
0 1 2
3 4 5
Tiffany Allens Zack Lilly Bobby Canter
ReDim Preserve BigArray(2)
ReDim BigArray(2)
Resizing an array erases everything currently stored in that array.
If you want to resize an array and save the data in the array, you can use the
Preserve command like this:
ReDim Preserve BigArray(2)
Not every programming language lets you resize an array and preserve its
contents.
C++
To create a resizable array in C++, you have to go through slightly different
steps.
First, you must define a resizable array like this:
datatype *arrayname;
So if you wanted to create a resizable array of integers, you’d declare your
array as follows:
int *numberarray;
Before you could store any data in this array, you’d have to define its size
using the new command. So if you wanted to resize the array to hold six elements
(numbered 0 to 5), you could use the following:
int *numberarray;
numberarray = new int[5];