Obfuscated Code in C

Question

Please explain how the following snippet of code in C is a valid one

int main(c, v) char *v; int c;{
 //program body
}

I stumbled across some examples from the International Obfuscated C code contest and i'm just curious.

Answer 1

It's K&R-style function declaration. See Function declaration: K&R vs ANSI

However, I don't believe it has a valid signature for main(), since v isn't of the right type. See What are the valid signatures for C's main() function?

Answer 2

It's the pre-ANSI style of function declaration, if you're referring to why the char*v; int; is outside of the parentheses.