Sydius Sydius - 10 months ago 66
C Question

Why are there digraphs in C and C++?

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

void copy(char d<::>, const char s<::>, int len)
while (len-- >= 0)
d<:len:> = s<:len:>;

My question is: why do they exist?

Answer Source

Digraphs were created for programmers that didn't have a keyboard which supported the ISO 646 character set.