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Data

Number Systems​

Binary​

Decimal to Binary​

Binary to Decimal​

Arithmetic​

Two's Complement and Sign and Magnitude Representations​

Binary Shifts​

They are of two types:

  1. Binary Logical Shifts
  2. Binary Arithmetic Shifts

Binary Logical Shifts​

Binary Arithmetic Shifts​

Hexadecimal​

Binary to Hex​

Hex to Binary​

Data Representation​

Character Sets​

Best explnation:

If it's still not clear, refer to this video as well (this also has some addiitional information)

Images (Bitmaps)​

Basic Video:

Sound​

Slightly out of syllabus:

Advanced guide (Please don't watch this if you aren't interested). Not in syllabus:

note

Make sure to also watch this video to be able to calculate the file sizes:

Data Storage and Compression​

File Sizes​

Basic introduction to file sizes:

Learn to convert between file size units:

Watch this video to learn more (some parts of it might be out of syllabus):

Lossy Compression​

has the highest compression ratio (the file is much smaller after compression)

loses data while compression takes place

Lossless Compression​

comparatively has a lower compression ratio

doesn't lose data while compression takes place

  • eg: Run length encoding

Watch this video to understand what compression is, and to learn more about lossless and lossy compression

Watch this video to learb nire about RLE (run length encoding)

Note: Please make sure to take a look at the flow chart in the text book.

Encryption​

Learn the basics:

Learn about symmetric and asymmetric encryption:

Learn the pigpen cipher:

Learn the ceaser cipher: ( You can also check this article (goes out of syllabus), it also has a python implementation of it )

This video about the ceaser cipher goes out of syllabus as well:

Introduction to vigenere cipher:

Learn more about vigenere cipher:

Learn the rail fence cipher:

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