If i do #if i==0 thn it vl cmpl it..means its tkng it as 0..bt why...
On 7/1/11, Dumanshu <[email protected]> wrote:
> i think it will take a garbage value for i because these are
> preprocessor directives.
>
> On Jun 30, 4:46 pm, himanshu kansal <[email protected]>
> 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 <
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> [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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Sent from my mobile device
Regards
Himanshu Kansal
Msc Comp. sc.
(University of Delhi)
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