Practice CLD-R Exam 1, Question 24 symbol?

I am cramming for the CLD-R. What is the little peace-sign looking symbol? It is from the sample CLD-R Exam 1, question 24.
Thank you!
Certified LabVIEW Developer
NI-VLM Administrator
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JulieC wrote:
I am the World's Most Interesting LabVIEW Programmer, after all.
Whoa...are you coming to NI Week? If so, you gotta come see my Tips and Tricks to Speed LabVIEW Development presentation...if nothing else, just to see the pop culture reference on my opening slide. Seriously, you quoted my as-yet-unreleased-to-the-public intro slide almost verbatim.
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman

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CLAD Sample Exam 1, question 2:

CLAD Sample Exam 1, question 2: can a wire be used to pass date between 2 llps that are intended to be runn in parallel? CLAD Sample exam1 provides the following url as an answer: http://zone.ni.com/devzone/cda/tut/p/id/9393 . This doesn’t explain the answer. Please provide a correct explanation.
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B Spears wrote:
NIquist wrote:
Is that the actual wording? Why can't they make these questions less
ambiguous? Just because you intend for the loops to run in parallel doesn't mean they actually do it. BUT, the data will still be passed between the loops eventually, so technically, YES, a wire can be used. Why didn't the question just say: "two loops that ARE running in parallel"?
The wording actually seems to be pretty decent. Two loops cannot be running in parallel if there is a wire running between them. The situation you describe--where one loop stops, data is passed, then the other loop begins--does NOT describe two loops running in parallel, rather two loops running sequentially.
When the question says "intends", it asks you to play the part of the designer of the code: if you want to have data passed between two loops, how would you design that? The answer is certainly not a wire.
True, but the fact that we're even discussing the semantics proves that it's confusing. I'm sure NI has a tough time coming up with multiple CLAD versions covering essentially the same questions but those questions should be testing for knowledge of LabVIEW, not English Language. A test taker should be able to focus on the what a question is asking and not how it's being asked.
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Does NI post solutions to CLD sample exams?

Does NI post solutions to CLD sample exams?
Thanks in advance.

There's solutions in the CLD sample exams zip file found here and there's a sample solution for the CLA exam.
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Security CLD sample exam

This is my answer to the CLD sample exam "security system" Does anyone have any suggestions or comments?
Attachments:
Alarm4.vi ‏35 KB
File.vi ‏16 KB

Islandman wrote:
... but I'm not sure what to do about the file reference. I use this to close the file at the end (that's why I circulate it). Since I log an event every time there is a change, I access the file many times, but I want to close the file at the end, only once.
No, you're not understanding. You are using "write to spreadsheet file", which is a high-level function. You can open it like a plain subVI and see what's inside. You will notice that it opens the file, writes (or appends) the data, then closes the file, all inside the function. Thus there is no need to open or close the file externally. At all! Ever! You have a useless and redundant mix of high-level and low-level file functions.
Sure, if performance is an issues, that constant file opening and closing could be a bottleneck. So an alternative would be to use all low-level file function. You would open/create the file before the loop, keep the file open during the loop and write using plain low-level functions, then close the file after (outside) the main loop once the program finishes.
ALSO: Your subVI needs a makeover anyway. Use intuitive control labels (not "numeric"!). Arrange the FP nicely. Add some documentation. You should also do something about the icon. It is surrounded by blank space, making the wires seem to hang off in thin air. It is also a bit disconcerting that you are not doing much error handling. The main program would never know if the file program encounters an error. Then you are abusing the file open error to determine if the file exists or not. There is a function for that! You don't need to get the date/time in the error case, so this function belong inside the other case.
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CLD-R sample exam #2, question #11

Answer A is the stated correct answer according to the sample exam answers section.
Correct me if I am wrong but Merge Errors ONLY reports the FIRST error. If multiple errors occur with those four error lines,
ONLY one will be reported by error out, not ALL errors.
Where I am going wrong with this one...is it because only one input to Merge Errors is used?
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1984 wrote:
In the past 12 years I have developped and deployed unreliable codes like this in about 10 different countries.
If this is unreliable then NI should start reviewing its own VIs as there are numerous VIs shipped with LabVIEW has solutions like this.
Hey, lets assume this is a control system for (Why not?) a 250kWatt weather radar
Stop the pulse modulator
shut down the RF Source
Remove power to the Klystron's magnet
Trust me, you want them to happen in that order. with code shown as drawn above, there is a possibility to remove the magnetic field first. That would dump a 60kV 12A pulse through the klystron with no field to focus the beam. At which point a 70 pound klystron is going to impolitely install a new hole in the building's roof.
Frankly, I despise that question as none of the distractors takes into account a failure in a predicated step of shutdown.

Considering the 4 hour CLD/CLA exam achievement and fulltime job.

Considering that during the CLD exam a programmer programs a small/medium application in 4 hours.
And a CLA architects a large application in the same time.
I understand that the pressure at one of these exams is about 250%.
During your job you would take more time to develop the same application,
because you cannot be at 250% all the time and you want to minimize errors.
I also know that a lot of time is used to get the specifications, talk to the client and make
a document that would be the equivalent to the exam paper.
What does a LabVIEW programmer do in a 40 hour work week, considering the exam is only 4?
I'm a CLD. Looking to get my CLA, but I have no colleagues who use LabVIEW and no peer-review.
I need information.
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Rodéric wrote:
This is a difficult question to answer since most CLAs are project managers so they don't code most of the time. I'm pretty sure if a CLA could code 40 hours that would be way more complete than a CLA test
I have to disagree there. Most of the CLAs I met are coding a large majority of their time. I'm a full-time LabVIEW programmer. I also have to manage some programs, but coding is the large majority of my time.
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Car Wash CLD Sample Exam Solution

Attached is my solution to the CLD Car Wash Sample Exam. Comments will be appreciated. The main VI is Main_6.15.10.
Thanks in advance.
Attachments:
CarWash_6.15.10.7z ‏60 KB

Here are my thoughts....
Your solution is functional, so there are points for that right away. Where I think there could be some more work is the architecture. The exam requirements state that the design must be "easily scalable". To me that means new states or cycles can be added without much messing about on the block diagram. If you notice, there are only certain... lets call them Properties of each cycle type. You could have an array of cycle properties such as cycle time, cycle position switches, cycle name, and flags for standard or deluxe. Then you could reduce your cycle handling to a single state that just indexes through the cycle array and executed the next appropriately flagged cycle.
I noticed a Select node in each of your cycle states with constant True and False wired to it. That is a total of three elements plus two wires that should have just been a Not right off of the Boolean palette.
You stop the program with a Stop button, yet you allow the user to close the window. You should consider a Panel Close? event in your event structure to handle a use trying to close the window so that you can execute a graceful stop.
There is no VI Description filled out for your main VI. You should also have an icon for the main VI. The suggested front panel shown in the exam has an icon.
When your VI is running, you have the scrollbars, toolbar, and menu bar shown. None of those serves any function for the application, so they should not be shown at runtime.
The Stop button that is used to stop your application is reset with a Property Node. Not that there is a performance issue here, but it is generally not good practice to do that unless you are forced to. Consider just using a Mechanical Action of Latch When Released instead of Switch When Released. That way you do not need to force the reset to the False state. Of course, I would rather see something like a Stop state writing to the While Loop conditional terminal. Also, you could have used a Local Variable to write the initial state of the Sim Switches instead of the Property Node.
The graders like to see code comments describing your algorithms. I would say that you need more of those.
A 10 msec timeout on the event structure is a bit hyper. Nothing in the system runs that fast, and the only thing you are waiting for is the user. You could actually have a -1 wired there if you add an event case for the Stop button and Panel Close. It will greatly reduce the CPU cycles (again not that there is a huge performance issue here).
Come to think of it, the 20 msec wait for next multiple timer is a bit hyper too. Your timing requirements are on the order of seconds. You do not need to loop that fast.
In general I prefer to have the Event Structure outside the State Machine. Either that, or I use the Event Structure as the State Machine (in place of the Case Structure). That way, if you need to respond to the user interface, you can do so without waiting to cycle back to the Idle state.
This one was not listed in the requirements, but it would be very helpful to see the clock. A cycle countdown timer or elapsed time indicator is so helpful to the user and the grader. It confirms that things are working properly and the the application has not sieved up. Users like to see something "alive" on the screen.
To end on a positive... good job remembering to Disable the Purchase Selection buttons once the user clicks one. I got ding'd for forgetting about that back when I took the CLD in 2003.

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Please Review my CLD Sample Exam

I am going to take the CLD in a month or so, so I figured I would work on some of the exams and post it up here for your advice.
I started with the Car Wash exam, and will do the other ones as well.
Thank you.
Any and all comments are welcome.
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Attachments:
Car Wash.zip ‏68 KB

On first look (not that I'm able to give any opinions about any CLD review)
Using a enum instead of string as a queue data type would lessen the risk of making a typo error when your programming, and makes the programming a bit faster it would also "lessen" the traffic since enum is a lesser datatype than string, and combining it with a typedef would keep changes up to date
Im taking the CLAD tomorrow, and am hopefully ready for the CLD right after that Hope it wont be difficult. Good luck!

CLD Sample Exams: How to deal with references ?

Hi@all:
I reviewed the sample exams solution for the CLD provided by NI and noticed, that they trifle with references. As shown in the Security System and the ATM Machine, references were opened, but not closed at the end.
What do you think, will this cost Style points?
The exams can be grabbed on the NI site searching for CLD.
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I would ding them for a lot of points but it is not my test but NI's so play to their rules get the cert and then do it right.
When you get to that part of the exam just add a note saying those refs do not need t be closed because they are static and maybe you can get some bonus points for knowing the differnence.
How to know the difference?
See here.
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Hello.
I'm thinking of taking the SCJP 6 Exam.
I looked into taking the SCJP 5 Exam a number of years ago, and purchased the SCJP 5 Study Guide from Kathy Sierra. However, work and life got busy, so I did not pursue it any further.
Would the book I have be good enough to do the SCJP 6 Exam, or should I bite the bullet and purchase the latest 6 book. Or are there any better books or even free online resources out there....
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user12167069 wrote:
I looked into taking the SCJP 5 Exam a number of years ago, and purchased the SCJP 5 Study Guide from Kathy Sierra. However, work and life got busy, so I did not pursue it any further.
Would the book I have be good enough to do the SCJP 6 Exam, or should I bite the bullet and purchase the latest 6 book.If all that busyness earned you some money, I'd say bite the bullet.
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Does the exam expect you to know all the subclasses of EXCEPTION and RUNTIMEEXCEPTION or is ir more likely to just test your knowledge on which have to be dealt with in order to compile?
I am not fimiliar with all the subclasses and this is why I ask. A question that states a mthod throws CannotUndoException may catch me offgaurd.
Another question is....
If you have a method and declare it to throw a runtime exception. Does that mean that if you call on that method that you must deal with it? IOW does it become a checked excption or will Runtime Exception never be checked by the compiler?

jwenting wrote:
exhort wrote:
To maintain sanity in other forums SCJP has been confined to its own forum,
This question (apart from the totally undescriptive title) has no relation whatsoever with the SCJP exam.
But then, neither does the majority of what's posted in that forum...Well, it seems to me the OP is asking about what to expect from the SCJP.
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Practice CLD-R Exam 1, Question 24 symbol?

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