I came across some weird-looking code. It doesn't even look like C, yet to my surprise it compiles and runs on my C compiler. Is this some non-standard extension to the C language and if so, what i...

I've just read this nice piece from Reddit. They mention and and or being "Alternative Tokens" to && and || I was really unaware of these until now. Of course, everybody knows about the d...

I'm trying to match some chunks if interesting data within a data stream. There should be a leading < then four alphanumeric characters, two characters of checksum (or ?? if no shecksum was sp...

I saw a line of C that looked like this: !ErrorHasOccured() ??!??! HandleError(); It compiled correctly and seems to run ok. It seems like it's checking if an error has occurred, and if it has, ...

Code: #include <stdio.h> int main(void) { ??< puts("Hello Folks!"); ??> } The above program, when compiled with GCC 4.8.1 with -Wall and -std=c11, gives the following warning: sou...

C++17 removed trigraphs. IBM heavily opposed this (here and here) so there seem to be arguments for both sides of removal/non removal. But since the decision was made to remove trigraphs, why leave...

We all know about the historical curiosity that is digraphs and trigraphs, but with all the changes made to C++ in recent years I'm curious: are they valid C++14? How about C++17?

I want to do a text search like google suggestions. I'm using PostgreSQL because of the magical Postgis. I was thinking on using FTS, but I saw that it could not search partial words, so I found ...

Given that there were once reasons to use digraphs and trigraphs in C and C++, does anyone put them in code being written today? Is there any substantial amount of legacy code still under mai...

I saw the following code from some legacy codes: size_t a = 1 ???- 2 :0; What does the symbol ???- mean in C++? How should I understand it?

I've got some (legacy) code that I'm building with clang for the first time. The code is something like: sprintf(buf, "%s <%s ????>", p1, p2); Clang gives the following warning (error with...

I had found a strange output when I write the following lines in very simple way: Code: printf("LOL??!\n"); printf("LOL!!?\n"); Output: It happens even the code is compiled under both MBCS ...

I created a new project with the following code segment: char* strange = "(Strange??)"; cout << strange << endl; resulting in the following output: (Strange] Thus translating '?...

I was looking at the escape sequences for characters in strings in c++ and I noticed there is an escape sequence for a question mark. Can someone tell me why this is? It just seems a little odd and...

According to C++'03 Standard 2.3/1: Before any other processing takes place, each occurrence of one of the following sequences of three characters (“trigraph sequences”) is replaced by the singl...