I don't know if the chart helps, but #define CTRL(x) ((x) ^ 0100) // e.g. 'C' ^ ... | Hacker News

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jart on July 21, 2022 | parent | context | favorite | on: What happens when you press a key in your terminal...

I don't know if the chart helps, but

    #define CTRL(x) ((x) ^ 0100)
    // e.g. 'C' ^ 0100 is 3
    // e.g. '@' ^ 0100 is 0
    // e.g. 'M' ^ 0100 is 13 a.k.a. \r a.k.a. enter

I like this explanation better. It also explains what notation like ^C means. It's shorthand for 0100^C.

jagged-chisel on July 21, 2022 [–]

Expanding your overloaded operator:

Crtl-C is shorthand for 0100 xor ‘C’

Also, the 0 prefix means this is a base-8 (octal) number

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