Re: [Vala] Why is 77 greater than 4294967295?

[Michele Dionisio <michele dionisio gmail com>]

You are working on an architecture where long and int have the same size.
And at the end you compare a long with an unsigned int. The unsigned int is
converted to long and the maximum unsigned long is a negative signed long.


Il giorno ven 23 nov 2018, 04:34 Jason Martin via vala-list <
vala-list gnome org> ha scritto:

> // simple vala code
>
> void main () {
>
>      long i = 77;
>
>      stdout.printf ("%ld\n", i);
> // outputs 77
>
>      stdout.printf ("%u\n", uint.MIN);
> // outputs 0
>
>      if (i < uint.MIN) {
>          stdout.printf ("Never made it here.\n");
>      }
>
>      stdout.printf ("%u\n", uint.MAX);
> // outputs 4294967295
> // G_MAXUINT
>
>      if (i > uint.MAX) {
>          stdout.printf ("Why am I here.\n");
>      }
>
> }
>
> valac --cc=gcc gbug.vala
>
>
>
> C code generated
>
> /* gbug.c generated by valac 0.40.11, the Vala compiler
>   * generated from gbug.vala, do not modify */
>
>
>
> #include <glib.h>
> #include <glib-object.h>
> #include <stdio.h>
>
>
>
>
> void _vala_main (void);
>
>
> void
> _vala_main (void)
> {
>      glong i = 0L;
>      FILE* _tmp0_;
>      glong _tmp1_;
>      FILE* _tmp2_;
>      glong _tmp3_;
>      FILE* _tmp5_;
>      glong _tmp6_;
>      i = (glong) 77;
>      _tmp0_ = stdout;
>      _tmp1_ = i;
>      fprintf (_tmp0_, "%ld\n", _tmp1_);
>      _tmp2_ = stdout;
>      fprintf (_tmp2_, "%u\n", 0);
>      _tmp3_ = i;
>      if (_tmp3_ < ((glong) 0)) {
>          FILE* _tmp4_;
>          _tmp4_ = stdout;
>          fprintf (_tmp4_, "Never made it here.\n");
>      }
>      _tmp5_ = stdout;
>      fprintf (_tmp5_, "%u\n", G_MAXUINT);
>      _tmp6_ = i;
>      if (_tmp6_ > ((glong) G_MAXUINT)) {
>          FILE* _tmp7_;
>          _tmp7_ = stdout;
>          fprintf (_tmp7_, "Why am I here.\n");
>      }
> }
>
>
> int
> main (int argc,
>        char ** argv)
> {
>      _vala_main ();
>      return 0;
> }
>
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