Question about iteger literals

[Uranuz via Digitalmars-d-learn]

> I see these rules but when I compile following code and it 
> fails with error it looks VERY stupid.
>
> import std.stdio;
>
> void main()
> {
> 	ubyte a = 15;
> 	ubyte b = 10;
> 	
> 	ubyte c = a + b; //What is happening there?! AAAAARGH! Are you 
> joking?!
> 	
> }
>
> Compilation output:
> /d837/f382.d(9): Error: cannot implicitly convert expression 
> (cast(int)a + cast(int)b) of type int to ubyte
>
> I'm just crazy about it! How could it happen?!

I just should forget about all integer type except *int*, because 
it make my head just explode!!!