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I learned today that there are digraphs in C99 and C++. The following is a valid program:
%:include <stdio.h> %:ifndef BUFSIZE %:define BUFSIZE 512 %:endif void copy(char d<::>, const char s<::>, int len) <% while (len-- >= 0) <% d<:len:> = s<:len:>; %> %> My question is: why do they exist?
Digraphs were created for programmers that didn’t have a keyboard which supported the ISO 646 character set.
http://en.wikipedia.org/wiki/C_trigraph