Trigraph Error

I read about trigraphs on MSDN site..and tried the following code..

Code:

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??=include <stdio.h> //  ??=  is equal to punctuation character #
int main(void)
??<  //  ??<  is equal to punctuation character {

  printf("Hello World\n");

??> //  ??>  is equal to punctuation character }

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Giving me error on the first.. line where I am trying to replace the punctuation character with the trigraph.. why is it.. so.. I cant understand.. There is no problem using. trigraph. after the main() header..

Trigraphs work fine for me on VC++ 6, what compiler are you using?

First of all sorry for the delay.. but I have tried the code on Turbo C. 3.0 .. But If it works well in the vc++6 then why did't it work in Turbo. C as What do I think about it is that it is not the Microsoft Compilor Specific.. what ..do you say?