read the transcript!
panel 1: a string is an array of bytes
ASCII is the simplest string encoding: 1 character = 1 byte. Let’s see how it works!
(We usually use UTF-8, which is WAY more complicated)
panel 2: every printable ASCII character
There are no accents because it’s an English encoding: the “A” in ASCII is for “American”.
panel 3: there are 128 ASCII characters
Only the bytes 0 to 127 are defined.
It’s very limited: you can really see why we need more powerful encodings like UTF-8!
panel 4: how bytes map to characters
Here’s a partial list, look up “ASCII table” for the full list. Bytes (in base 10) are on the left, characters are on the right.
33 is !, 34 is “
48 is 0, 49 is 1
64 is A, 65 is B
97 is a, 98 is b
panel 5: a trick to translate from lowercase to uppercase
In ASCII, the lowercase letters are 32 more than the uppercase letters. So you can just subtract 32!