I recently stumbled upon an interesting piece of C language trivia that underscores how different computers were when C was first created. Specifically, C allows the use of digraphs (two letter combinations that represent a single letter) like as alternatives of { and } and <: and :> as substitutes for [ and ]. The purpose of this was to provide an alternate syntax to support keyboards and character sets where braces and brackets were not available. The Gnu C Language manual mentions these digraphs as well as %: as an alternative to #. Since nothing on the internet can be trusted anymore I wrote a simple program and compiled it to verify the claims.

#include 

int main()  = ; 
    for (int i = 0; i ); 
    %>
    return 0;
%>

And lo and behold (don't take my word for it) it worked! While it's hard to imagine a keyboard without these symbols today, and I might be showing my ignorance of international keyboards here, I'm glad someone thought to include these alternatives.

But if the cpp reference is anything to go by there is is an expecation that all keyboards must have ?,

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