i think it will take a garbage value for i because these are
preprocessor directives.
On Jun 30, 4:46 pm, himanshu kansal <himanshukansal...@gmail.com>
wrote:
> 1 more thng....if its possible to eval. variable expression lyk abv...
> thn...
> int i=2;
> #if i==2
> printf("hi");
> #else
> printf(""bye); //prints bye....i think it shld print hi...
> #endif
>
> even this code prints bye.....
>
> int i=3;
> #if i==2
> printf("hi");
> #else
> printf(""bye);
> #endif
>
> On Thu, Jun 30, 2011 at 5:13 PM, himanshu kansal <
>
>
>
>
>
>
>
>
>
> himanshukansal...@gmail.com> wrote:
> > somewhere i read dt conditional compilation such as #if and #elif etc
> > cn only use constant expressions and previously defined macros....they
> > cant use variables cz preprocessng is done b4 compilation...
> > bt whn i try it on gcc and vc both r compiling it with variables abs.
> > fyn....even disabling extensions dint work....
> > i.e int i;
> > #if i+1
> > printf("hi"); vl print hi...no error occurs
> > #endif
>
> > thn i read it on net dt it cn eval. varables also....
> > nw m confused who is ryt...
> > whtr it cn eval var also or nt...
> > nd if it cn thn hws it possible dt preprocessor knows d val. of var.
> > b4 compiling d prog.......
>
> --
>
> Regards
> Himanshu Kansal
> Msc Comp. sc.
> (University of Delhi)
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