run a c program without using main function

you know guys! it is really possible...
and it is so simple, you can easily do this!!!
here is a program....
run it and watch result!!!

#include
#define decode(s,t,u,m,p,e,d) m##s##u##t
#define begin decode(a,n,i,m,a,t,e)

int begin()
{
printf(" hello ");
}

princy gupta(2nd yr)
MMEC