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.......
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