Grotesque C tricks

[Dan Neely]

Write a small C program, which while compiling takes another program from input terminal, and on running gives the result for the second program.[^]

3x12=36 2x12=24 1x12=12 0x12=18

[PIEBALDconsult]

Huh, never thought of that. # include "sys$input" HP C V7.3-009 on OpenVMS Alpha V8.3 says:

JB> cc/war=verb i.h

include <stdio.h>

Exit
Exit
Exit

include <stdio.h>

..^
Cannot include files in a prologue or epilogue file.
at line number 1 in file SYS$INPUT:__DECC_INCLUDE_PROLOGUE.H;
Description: It is not possible for a prologue or epilogue file to perform an #include directive. This might lead to nested inclusi
on.
User Action: Remove the #include directive from the prologue/epilogue file.

(Note it takes three Ctrl-Zs to get it to work.)

JB> cc/war=verb/first=stdio.h i.h
void main(){printf("Hello, world!");}
Exit
Exit
Exit
JB> link i
JB> run i
Hello, world!
JB>

[HimanshuJoshi]

cool :cool:

[Mike Hankey]

Pretty slick...never thought of that?

"Life can only be understood backwards, but it must be lived forward." Kierkegaard, Søren

[NormDroid]

Almost as a bad as a VB user I worked with on an airport project. His concept of multithreading was to how 2 programs running on the same server and commuting data between them via tcp/ip X| Luckily the error was corrected with an immediate rewrite in C++.

Software Kinetics - The home of good software

[_stefanu_]

You should check out IOCCC.

[Dan Neely]

I'm well aware of it, stuff like the pi calculator[^] is awesome. That was simply grotesque.

3x12=36 2x12=24 1x12=12 0x12=18

[Rajasekharan Vengalil]

Neat. Works with VC++ as well. Like so:

D:\Code\vc\solos>type reader.c
#include "CON"

D:\Code\vc\solos>cl /nologo reader.c
reader.c
int printf(); int main(int argc, char *argv[]) { printf("hello, world\n"); return 0; }

D:\Code\vc\solos>reader.exe
hello, world

-- Raj alias "Ranju" alias "gleat" http://blogorama.nerdworks.in[^] --

[austin hamman]

actually thats a perfectly fine method of concurrency (known actually as multi-programming) his only error was using visual basic. multi-programming is a common mechanism for *nix programs (usually with a client/daemon setup, or a small program that runs and then goes away) though on *nix you wouldnt use sockets you might use pipes but more likely you just do your stuff via stdout/stdin or if you used fork() then ipc is done via shared memory. it usually faster to spawn a process in a *nix environment than, say, a windows environment. also by splitting a program into two you can make development easier, more secure (as you can have one program that needs certain permissions running under those permissions with well defined and tested interfaces)

[Rick Shaub]

Since pre-.NET VB doesn't support multithreading (even using Win32 DLL imports), this is a legitimate method of concurrency.

[englebart]

Not legal in C++, but it worked in C.

switch (i) {
case 0:
case 1:
f0and1();
if (i != 1) {
case 2:
f0and2(); // but not 1
}
case 3:
f0and1and2and3();
}

The if statement around the case is the kicker.

[Ben Breeg]

Norm .net wrote:

His concept of multithreading was to how 2 programs running on the same server and commuting data between them via tcp/ip

This could be done easily on the Commodore Amiga. Instead of using tcp/ip one used Arexx instead; the Amiga interpretation of the Rexx language.

I am the Breeg, goo goo g'joob Aici zace un om despre care nu sestie prea mult