take a look at this thread:
http://groups.google.com/group/google-code/browse_thread/thread/e0ade8e0273dc5af/c15e348fecf740fc?hl=en&lnk=gst&q=how+to+change+system+standard+input+and+output#c15e348fecf740fc
I think the solution from ricardo is the better for you, cause there's no
need to change your code..
grato,

Gustavo Pacianotto Gouveia

Escola Politécnica da Universidade de São Paulo
   gustavo.gouv...@poli.usp.br
   gl_lg...@hotmail.com
   gustavo.paciano...@gmail.com


2010/8/8 Avijit Singh <avijitsinghthaku...@gmail.com>

> hey! i got a doubt actually using our own header files how can we change
> the standard input and output for a program
> for example i want to make file as my standard input and output how can i
> make it.I know that the above thing will work if i used file header file
> like fstream.h and all but i want to use scanf for taking input from the
> file instead of the keyboard so please tell me the way
>
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