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desde Febrero 12, 2023 - 01:04:47CGX#4: Ascii Encoding (Encoding, Training, CGX)
ASCII Encoding
Hello future Hackers,
We have created the next lesson.
This time we talk about ascii encoding.
Again, the challenge is more informative and gives no points.
Happy Challenging!
- gizmore and x
We have created the next lesson.
This time we talk about ascii encoding.
Again, the challenge is more informative and gives no points.
Happy Challenging!
- gizmore and x
problem: 4
problem_box: ,72 101 108 108 111 32 73 110 118 105 116 97 100 111 46 32 83 111 108 117 116 105 111 110 58 32 65 53 56 79 101 75 49 97
Computers can only work with numbers.
We need a mapping, for converting numbers to written characters, to display text to humans.
The [ASCII](https://en.wikipedia.org/wiki/ASCII)
[encoding](../README.md)
was one of the first encoding to solve this problem.
## ASCII
- 1 byte per character.
- Original 7 bit + 1 bit [checksum]()
- [ASCII Table](https://www.asciitable.com/)
## Other encodings
- C64 Screencode (A=1, B=2, ...)
- 8bit ASCII / extended ASCII
- Win ISO
- Unicode with UTF 8/16/32
## PHP Implementation
- number to letter (chr())
- letter to number (ord())
- string encodings in PHP