How does QR-code work? [closed] - encoding

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Can you please explain me How actually QR codes are created and How they are decoded. There are lots of websites and apps that can do the job. Here I have created a QR-code for the character QR12 by the website and this gives the following code :
I have decoded it to verify with the website and this gives the correct result.
I a'm very much interested to know the logic behind this to encode each character which is related to each square block. If I want to create this QR code by hand using pen and white paper, how can I do this. How can I do the reverse process also manually.
Thanks in advance.

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How can I format code properly in a ChatGPT prompt? [closed]

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I've tried the usual markdown syntax, for example:
```py
# Here's my Python code
import this
```
But it doesn't seem to work, it just displays it literally as if it was plain text. I wasn't able to find information as to whether markdown was the right syntax, or if there's another one, or if there simply isn't one. But when it replies with code, it does display it in a proper format (monospace font and everything), so that seems to indicate that there might be a way.
Of course this doesn't hinder its comprehension of code in any way, it's just for me, if I want to review the conversation later.

Why my firefox browser keep directing to a blank website with extremely long url after mouse clicking? [closed]

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Closed 8 years ago.
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This is the link I encounter. I only extract a half part of the link. It's really long.
http://srv123.com/ads-clicktrack/click/newjump1.do?affiliate=64485&subid=024&terms=austin%20texas%20youtube.com%20video%20sharing%20camera%20phone%20
Why did I have this disturbing link? How can I fix this issue?
Sounds like you have some spam-ware infecting your browser.
Run Spybot search and destroy and Hi-jack this to remove them.
Also uninstall any random software from your browser and computer.

Digital Computer Architecture Help Needed [closed]

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Closed 8 years ago.
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let's say I have a 2-Mbyte chip and need to construct a 8-Mbyte memory. I need to show the address lines in a diagram and explain what the address lines are used for. How would I go about doing this?
If I remember correctly you could make it with 4 2-Mbyte chips.
The first 2 bits of the address are used to select which chip you need. Then the rest of the address is sent to the selected chip.

how to use a data from matlab as a input in simulink [closed]

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Closed 9 years ago.
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Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn't work, and the expected results. See also: Stack Overflow question checklist
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To all MATLAB and Simulink users
I am new in matlab and simulink. I calculated a motion with time in matlab and then I would like to use it as a input data in simulink. Anyone can teach me how to do this please. Please tell more details (which block and how to set both in M and S) as I am a really really new user.
Thanks.
the block you are looking for is called From Workspace. The easiest way to import data with it is maybe as a time series. Try using your data, and read this for trouble shooting.
Also this https://stackoverflow.com/a/8330468/2554157

Is it possible to send a file attachment (txt) from iphone via email? [closed]

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Closed 9 years ago.
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I saw two related questions about this topic - one has an old link in an answer and this one doesn't have an answer (right now).
(I am new to iphone development)
I want to create a file from my app, then send that file as an attachment. Is this possible?
I'm not looking for someone to send me teh codez - just SPECIFIC references and links.
thanks
That's part of the new Message UI Framework in >2
MFMailComposeViewController addAttachmentData:mimeType:fileName: