Are there any coding standards for VBA within Excel?

Especially, I'd like to know when it is appropriate to output one or other of the standard error codes (viz#N/A, #REF!, #NAME?, #DIV/0!, #NULL!, #VALUE! and #NUM!) in response to bad i开发者_如何学Gonputs.

For example, which one is the best to be output in the event that a negative value is given as the second parameter to a Beta function?

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#NUM! would be the appropriate error.

From Excel's help:

#NUM! Occurs with invalid numeric values in a formula or function.

For completeness, the descriptions of the other errors are as follows:

##### Occurs when a column is not wide enough, or a negative date or time is used.

#VALUE! Occurs when the wrong type of argument or operand is used.

#DIV/0! Occurs when a number is divided by zero (0).

#NAME? Occurs when Microsoft Excel doesn't recognize text in a formula.

#N/A Occurs when a value is not available to a function or formula.

#REF! Occurs when a cell reference is not valid.

#NULL! Occurs when you specify an intersection of two areas that do not intersect. The intersection operator is a space between references.