Just started scripting recently and the following has been bugging me:

Script File Name C:\Add.ps1

My guess would be that when you specificy a parameter, even if that value is null, it will not use the "default" value.

When you call add with $args[ 0 ] and $args[ 1 ], it is calling add and assigning $null (which is evaluated as 0 when cast as an int) to both $x and $y.

The result of calling add with two null values is 0 + 0.

If it was really 0 + 0 then wouldn't the result show up as 0? It doesn't show anything.

I do get 0 when I run it. You are getting no output?

No problem. In the case of strings, $null gets cast to "" which is an empty string, which could look like no result.

Appreciate the help. Assigning a default value to a function seems to be useless then if you can't use $args to pass a blank value to the function allowing it to use the default value.

Honestly, I would avoid doing it this way. My suggestions, in no particular order:

- Don't use $args--it's so easy to do named params in powershell which are vastly superior
- Remember GIGO. If you pass $null's into the add function, then $null is what you get out!
- Why not move your entire Params() block to the first line of the script (and remove the last line)? That will make it behave as you think it would.
- To make it work like you want, with the logic exactly as you want, then you would need to perform tests to see if there are $args and if so, do it this way and if not, call the function w/o any params, which would allow those defaults to kick in. e.g.



But again--I wouldn't use $args because I've totally written them off. :)

P.S., the forum software doesn't like bracket-number-bracket for some reason. Inserting a space is a workaround until we get that fixed.

Or even

Thanks a ton hair9000. That has helped me out greatly!