Exercise: Elmer - colouring cells

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> Excel VBA Macros  (38 exercises)
Topic ==> Looping over collections  (7 exercises)
Level ==> Average difficulty
Course ==> Excel VBA macros
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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When you open the file above, you should see Elmer the elephant.  It's worth noting that this picture has nothing whatsoever to do with this exercise!

Excel VBA Macros exercise - Looping over collections (image 1)

Elmer is a playful but responsible elephant - here seen with his duck

Create a macro to colour (say) A1:J10 at the top left of the worksheet in random colours from 1 to 32.

Use a line which sets the Interior.ColorIndex property of each cell in the range to Int(math.rnd()*32)- and ask your trainer to explain this if it doesn't make sense!

Here is what the worksheet should look like after you run your macro:

Excel VBA Macros exercise - Looping over collections (image 2)

This is the effect you should get

If you get the macro working, try nesting it inside another loop so that the pattern is continually redrawn.  Here is the outline of the code to do this:

Excel VBA Macros exercise - Looping over collections (image 3)

100 times is more than enough to get the idea!

Save this workbook as Elmer pattern, before you do serious damage to your eyes!

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