can ia define main like this

main(int, *char)

Yes, approximately

is a legitamate program that will compile
with no warnings (unless you use -Wall)

Mind if I ask why you want to declare main that way?

That would be a prototype. By convention, main is already "defined",
and depending on how close to ANSI C you set the compilation options
you may or may not get errors.

The standard way to do main is
You really should consider this to be THE way to write main().
Some early DOS compilers like Turbo C would actually complain if you did not use argc and argv in your code and you declared them as main() arguments like above. Which IMO is nonsense.

Some compilers will let you do:
Generally, you want you code to return success/failure to the shell, so this is not a great idea.

i don't know, it's curiosity

Think of it this way:
Just because you can take a pistol and shoot off your big toe doesn't mean that you should.

Same thing in programming. Maybe it's nice to know, but you don't need to shoot yourself in the foot just because you can.

This link is now obligatory.
http://burks.brighton.ac.uk/burks/language/shoot.htm

that's awesome

Also, I should point out that given the way the question was phrased, the only possible answer is "yes"

You CAN do whatever the hell you want...whether it works or not is a different question entirely

i'm going to go ahead and second mr. Weber on that