CS146 - 01-22-2026

More on ASCII etc...

Recall: Characters - each character needs a numeric code that represents it.

• 7 bits are used so that the last 1 bit can be used for other things, like error thingies

  • The first bit is usually 0, allowing 2^7 possibilities

  • What if the first bit was 1?

    • Thus, We Added new symbols, and shit

      • But this STILL isn't enough to represent every kind of character !

      • Solution: A new encoding, called Unicode

        • 10 Million possibilities.

ASCII Code:

// Some code

'\n' = 10
'\space' = 32
'0' - '9' = 48 - 57
'A' - 'Z' = 65 -90
'a' - 'z' = 97 - 122
 

EBCDIC: Extended Binary Coded Decimal Interchange Code

• Had gaps, and thus was not preferred to be used.

utf8, variable length type of encoding, used to transfer from ascii to unicode?

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Convert a digit char c to its numeric value: $c- '0'$