#include<cstdio>
int /***
nt ///
c * "
l / ,
u ((
d )"w
e m{Ho
< aper
c iull
s ntld
t /so!
d/ */ main/*/""
i*/ (){puts/*/)
o*/ ("Hello"/*;
>*/", world!");}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).