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 <
[email protected]> 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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