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I am sorry but I have no idea what you are referring to - can you tell me what part of the video you are referring to so I can tell you what it means? I would love to help, I just need to know what part of the video your question is in reference to.

@@erbcomputerscience 1:51:13, the code returns "the item is 999999", im not sure about that part

@@crest1 Ah I see what you are referring to now. The first 6 digits of the item code refer to the item with the 7th digit being a check digit. We enter that into the queue first - 999999X. The check digit(X) is not part of the item code though so only the first 6 digits are. The reason the check digit is X is because the result of the mathematical calculation is 10. We cannot use 10 as the check digit because it is a 7 character string (including the check digit) and not 8. If the item has a valid check digit it is added to the queue and if it is not valid it is not added to the queue and we increment the number of invalid items. When we call Dequeue it outputs the first item that was added to the queue which is the item number 999999. Queues work on the first in first out principle. It removes items in the order they were entered. Because the number 999999X has a check digit of X and is valid, it is the first one outputted from our queue. It is only the item number and not the check digit since just the item number was stored and not the check digit. That is what the substring method does in the video when we do: Result = Input.Substring(0, 6) - It isolates character 0-5 but not character 6 which is the check digit. Remember, when we start counting at 0, 0-6 would be 7 characters, but we just need the item number. The directions say to add the item number to the queue. Our substring starts at 0 and isolates the first 6 characters starting from character 0. 0 1 2 3 4 5 --> 6 Characters total for the substring 9 9 9 9 9 9 -->The item number Does that make sense?

That's a great question. Single and Double take up less memory than Decimal but are less precise which can lead to slight miscalculations. These miscalculations can become very large if data is being processed hundreds or even thousands of times. Remember in 13.3 when you did Mantissa and Exponent? Bits are split between range and precision. Both use fractional binary but are not precise. This is okay if you're doing physics calculations where you only need to go to say 3 significant digits. It's okay that the last few places being held as a decimal are off slightly. When dealing with finances or any program dealing with finances you should use Decimal because it is extremely precise meaning it has higher precision than Single and Double. You definitely do not want a client (or even yourself) to have missing money. Think of a business that is doing thousands of transactions a month. If we are having miscalculations that would lead to lots of money missing throughout the year and it wouldn't match the accounting books at all. Decimal is extremely precise but it is slower than Single and Double and also takes up more memory. In today's world memory isn't really a problem (unless you have a really large program) and speed isn't so much of an issue the way it use to be. For your Cambridge exam it really comes down to choice. I want very high precision so I always use Decimal and tell my students to as well. If you would like to use Single or Double you are more than welcome to, just remember, it doesn't have as high precision as Decimal. Also, Cambridge will give you marks if you have a working solution. In an OOP exercise where they say the data type is REAL, you can use Single, Double or Decimal and they would give you marks for it. Does this help?

@@erbcomputerscience Wow, really appreciate the elaboration sir!

You got it. I have a one more P4 review to do and then I'll do your recursion video with some P3 questions. It'll be sometime this week and I'll get it up as soon as possible for you!

@@erbcomputerscience Thank you but can you please put it up before this wednesday as I would be taking my p3 this wednesday.

@@Hritikesh-p7q A new video before then would be very tough as I have a full day Monday and Tuesday. Here is a video I have that walks through a recursion problem from a past P3 exam that I hope you find helpful. ruclips.net/video/XuhY2L-5MGo/видео.html It walks through a past question as I mentioned which is what you are looking for. Let me know if I can answer any questions for you before your exam if you have any. I would say good luck but you're not going to need it because you got the skills and will crush that P3 and P4 exam!

There's another one in the works and on the way. Should be live in the next couple of days or so.

Here it is: ruclips.net/video/LawOyp5dnuE/видео.html Hope you find it helpful!

Glad it helped!!!

For Paper 4 students save their evidence document digitally and the proctor takes a digital copy that is uploaded to Cambridge. There are no printed documents sent.

Yes but I need to get through this hurricane first. The eye of the storm will be coming right over my area of town so it'll be a few days until I can get to it but will as soon as I can.

@@erbcomputerscience Stay safe! I completely understand, no rush at all.

We finally got our power restored from the storm. Here is the video you requested: ruclips.net/video/L9at0QMoYFI/видео.html Hope you find it helpful!

You're welcome. Glad you found it helpful

Sure. Give me a few days and I'll let you know when it's posted. In the mean time you can find some more Paper 4 review items if you're interested: Computer Science 9618 Paper 4 Topics: ruclips.net/p/PLaxAmCZMlFC2nrMaNcBUk4r1XeB9ouCZi

​​@@erbcomputerscienceLooking forward to it. Also sir along with these, if you could also post the walkthrough which you felt was the hardest that would also be great in order to prepare for the worst scenario! ❤

You're welcome. You can find a playlist here covering several Paper 4 topics. Hope it helps! Computer Science 9618 Paper 4 Topics: ruclips.net/p/PLaxAmCZMlFC2nrMaNcBUk4r1XeB9ouCZi

You're welcome. Hope it helped. Here is a playlist I compiled for a lot of topics that could show up on Paper 4 if you need it: ruclips.net/p/PLaxAmCZMlFC2nrMaNcBUk4r1XeB9ouCZi

Glad it helped! Here is a playlist that covers a lot of Paper 4 topics in case you would like to have it: ruclips.net/p/PLaxAmCZMlFC2nrMaNcBUk4r1XeB9ouCZi

You are welcome. I have more videos that walk through some more paper 4 full exams and paper 4 items if you are interested. I have compiled a playlist that walks through everything you may need to know for Paper 4. You can find the playlist here if you want to use it=: ruclips.net/p/PLaxAmCZMlFC2nrMaNcBUk4r1XeB9ouCZi

@@erbcomputerscience thank you so much life saver

Absolutely. Should be posted in the next few days

That is correct.

@@erbcomputerscience Thanks a lot for the overall clarification on evidence doc! Hope you would bring out some more tips and tricks related to P4.

Glad you found it helpful!

Another full P4 walkthrough is on the way! Make sure to stay tuned as it should be posted in the next few days.

@@erbcomputerscience You're the best!

Just created another video since we were off today for the hurricane off the west coast here of FL in the U.S. Here is the link that covers a circular queue as well as how to use the evidence document. Hope it is helpful! ruclips.net/video/pR9DRcG5NWM/видео.html

Yes. I will make a video in the next couple of days for you. I'll make sure you'll be ready and confident on how to do it on exam day. Just out of curiosity, you don't have a teacher but you guys still have the class at your school?

@erbcomputerscience thank you so much will really appreciate that bcoz i really wanna pass.....yh we no longer have a teacher but we still have to write tho

Not sure if you saw this video but it shows you how to use the evidence document with an actual question from Paper 4 - ruclips.net/video/pR9DRcG5NWM/видео.html I hope you find it helpful! Let me know if you have any more additional questions!

Here you go. Hope you find it helpful! ruclips.net/video/pR9DRcG5NWM/видео.html

Thanks a lot

Here is the newest P3 walkthrough just uploaded: ruclips.net/video/gPzgZ81h3pU/видео.html Hope it helps!

You're welcome. Glad it helped!

They are in the syllabus. Random Files do not show up on Paper 4 (because these are binary files) and only text files will show up on Paper 4. They could show up however on Paper 3. I will make a video (it will be sometime this week) going over random files and include some questions that could show up. I will also make a separate video on programming a dictionary so we can see it in action. I am thinking I can have both of those up by sometime this week? Sound good?

@@erbcomputerscience That's amazing thank you sir you're the best

Here is your dictionary video. Hope it helps! ruclips.net/video/57nybipQMME/видео.html I will film the random files video later this weekend.

It does include containment and aggregation. I will get a video ready soon to cover both of these concepts. I am glad the videos are helpful!

Hoping for a video drop soon as exam's right around the corner. Thanks a lot

I'll try to get it up as quickly as possible. It will definitely be in the next few days if not later today. I'll let you know when it's posted and send you the link.

I thought containment is a concept more relevant to windows form

@@lovejoykufa6476 What do you mean by windows form?

You are welcome!

Glad they help!

Great question! The direction does not matter. They just want to see if you know it loops.

Absolutely. This is a great idea. It'll be up in the next couple of days. I'm just curious, are you testing in October of this year?

@@erbcomputerscience Yes sir, p4 is on 30 oct. Thanks

@@reflectmirror6371 I am currently making your video now. I saw your question about checking if a variable is a string and there is no method for that. What we can use though is a for loop that isolates each character and then uses the .isLetter method of the character class. I will put that in the video. The video will encompass multiple topics but I will put the string manipulation at the front for you so you don't have to search for it. Should be up in the next couple of days.

Not sure how I could remake those videos and make them better. It is impossible to display multiple pages at a time in a video without having the text very small. Is there a question you have where I can clarify something about trace tables for you? Do you have a question about SQL that I could clarify something?

You're welcome. Hope it helps!