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sanchayita

You are probably thinking "errors are bad, I don't want that!", but this is actually a very good error - as it tells you about problems that are hard to spot otherwise. Have a look at this code, can you see why it gives the wrong answers? vb Code: Dim MyVariable As Integer MyVariable = 10 MsgBox MyVariable 'should show 10 MyVariable = MyVariable + 1 MsgBox MyVariable 'should show 11 MyVariable = MyVaraible - 2 MsgBox MyVariable 'should show 9 Instead of showing us "10", "11", "9", the messages actually show us "10", "11", "-2"! The reason for this is that I mis-spelt the variable name (MyVariable = MyVaraible - 2), so VB being 'kind' creates a new variable (which has a default value of 0), and uses it in the calculation. In the code above it is fairly easy to spot the mistake, but the more code you have the harder it gets to find mistakes like this - generally all you know is that the code is not working properly, but you can't tell why. Instead of spending lots of time trying to work it out, simply having Option Explicit at the top of the code file will tell you what (and where) the problem is, so all you need to do is correct the variable name (or declare the variable, if it was meant to be a different one!).