freopen("filename","r",stdin); -> for taking input from file. ( r :: in
read mode )
freopen("filename","w",stdout) -> for redirecting output like printf to
file . ( w: in write mode ).
u can also replace file name with argv[1] like freopen(argv[1],"r",stdin);
basically when u give input from keyboard , it is first stored in stdin
buffer , then the programm takes the input from stdin buffer , ex:
scanf("%d",&h); so input to h will be taken from stdin buffer, but as u r
loading filename to stdin buffer , inputs r taken from file by programm ,
creating illusion that u r inputting value from keyboard , now if u do
printf("hh"); then first "hh" goes to stdout buffer, then it is displayed
in screen from stdout buffer, but now u r STORING the contents of stdout to
filename in w mode.
want some more help ::
http://www.facebook.com/profile.php?id=100000627369242
On Wed, Sep 7, 2011 at 11:57 AM, Ameer Ayoub <[email protected]> wrote:
> Another common technique I've seen with regards to code jam that I've used
> and have seen in some solutions of others is to simply use stdin/stdout and
> redirect the file to stdin and the stdout to a file using the terminal
> (using < and > respectively). Learning to use file streams is definitely
> important if you don't know, but I'm just putting that out there since it's
> a useful technique within the context of google code jam since it quickly
> allows you to view the output in the terminal and redirect it to a file if
> you need to and saves a bit of typing in the solution. (see
> http://www.linuxsa.org.au/tips/io-redirection.html for more information
> about redirection, windows supports something similar as well)
>
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