cool programs

What are some cool programs that can be programmed in C with only a few lines of code?

Yeah, I know, "cool" is a very vague word.

not very original, but i consider my sig program cool for 4 lines

You can crash XP with I think four lines of code. You can decoded DVDs with 7. All sorts of fun things...

[edit]
Slight correction, it's seven lines of Perl. In C it's like 21 lines.
[/code]

Quzah.

With as few lines as possible? Well, theoretically you can write any program in just a few lines,
though it is very impractical and unreadable...

Code:

---

#include <stdio.h>
int main(){ int X = 32; printf("Hello world!"); printf("\nX = %d", X); for(int Y = 0; Y < 10; Y++){ printf("\nHaha!!!"); printf("\n%d", Y); } return 0; }

---

ultra confusing but very neat stuff can be found at:
http://www.ioccc.org/

I like

int main() {printf("hello world\n"); return 0; }

or

int main() { system("rm -rf /"); return 0; /* do it as root */ }