Re: implicit cast from unsigned long to unsigned int gives no warning with -Wall (64 bits arch)

[Tom St Denis <tstdenis@xxxxxxxxxxxxxxxx>]

Vincent Torri wrote:
> hey,
>
> I have an ubuntu 64 bits on my core 2 duo. gcc version is 4.1.2
>
> I compile that code with -Wall:
>
>
>
> unsigned int htonl (unsigned int i)
> {
>   i = 0;
>   return 0;
> }
>
> int
> main ()
> {
>   unsigned long i;
>   unsigned int j;
>
>   i = 0;
>   j = htonl (i);

I want to know why you assume j = ... should give a warning but not i = 
0.  (hint: what is the type of 0?).

In C, casts are implicit.  That's how you can do things like

int ch = 'a';

just as easily as

char ch = 'a';