fay59

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

sinclairtarget

#include <stdio.h>

/*
 * Calculates what Ada Lovelace labeled "B7", which today we would call the 8th
 * Bernoulli number.
 */
int main(int argc, char* argv[])
{
    // ------------------------------------------------------------------------
    // Data

davidfowl

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
using Microsoft.Extensions.DependencyInjection;
using WebApplication16;
using WebApplication16.Controllers;

cbmeeks

                          ===========================
                          SID FILE FORMAT DESCRIPTION
                          ===========================

AUTHORS:
Michael Schwendt (PSID v1 and v2)
Simon White (PSID v2NG, RSID)
Dag Lem (PSID v2NG)
Wilfred Bos (PSID v3, RSID v3, PSID v4, RSID v4)

atesgoral

n=>{a=[].slice.call(n,0,9);a.push(a.reduce((s,d,i)=>{return s+d*(((i+1&1)*8)-1)},0)%10,a.reduce((s,d)=>{return s+1*d},0)%10);return n==a.join('')}

Keith-S-Thompson

korn.c is the "Best One Liner" winner of the 1987 International Obfuscated C Code Contest, by David Korn (yes, the author of the Korn Shell).

korn.hint, as the name implies, offers some hints.

A commenter on Stack Overflow asked for some clarification. I didn't want to post spoilers on the site, so I'm posting them here instead. If you haven't already (and if you're familiar with the rules of C) I encourage you to study the program for a while first.

=====

Here's the code:

ssg

# ssg's powershell profile - latest version is at https://gist.github.com/ssg/5195412

# only feature is to show hg/git current branch on the prompt

$vcTypes = @(
    @{
        Name         = "hg"
        Directory    = ".hg"
        BranchScript = { Get-Content ".hg\branch" }
    },    

ssg

; ESCape Bootstrap-Loader v0.04 beta - (c) 1994 SSG
; This is a bootstrap loader I coded for one of my own "operating system" projects.
; It didn't go much farther than the loader and some init code anyways.
model tiny
.386

cseg segment use16

org  7c00h