[Caml-list] Hello

[Caml-list] Hello

[bessam.abdulrazak]

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[Caml-list] Hello

[varesenews]

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[Caml-list] Hello

[bgadil]

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Hello

[Troy Spier]

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Hello! I just read a page on the OCaml website about submitting questions. Well, I have a question for you. How would I put the user input into a text file, that can be read and modified? Let's say I used this function for the input, how would I create a text file of it:
 
 print_string "What's your name ? "; let name = read_line () in Printf.printf "Hello, %s.\n" name ;;
 
 Thank you for all your help.
 
 - Troy
 
		
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Re: [Caml-list] Hello

[Jonathan Roewen]

> print_string "What's your name ? "; let name = read_line () in Printf.printf
> "Hello, %s.\n" name ;;

let o = open_out "filename";;
output_string o name;;
close_out o;;

Re: [Caml-list] Hello

[Jonathan Roewen]

Actually, I should've just linked you to the standard library
documentation (http://caml.inria.fr/pub/docs/manual-ocaml/libref/index.html).

Re: [Caml-list] Hello

[Corey O'Connor]

The beginners list is a good place to ask these sorts of questions:
http://groups.yahoo.com/group/ocaml_beginners

-Corey

On 3/13/06, Jonathan Roewen <jonathan.roewen@gmail.com> wrote:
> Actually, I should've just linked you to the standard library
> documentation (http://caml.inria.fr/pub/docs/manual-ocaml/libref/index.html).
>
> _______________________________________________
> Caml-list mailing list. Subscription management:
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> Archives: http://caml.inria.fr
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>


--
-Corey O'Connor

Re: [Caml-list] Hello

[yoann padioleau]

> 
> > print_string "What's your name ? "; let name = read_line () in Printf.printf
> > "Hello, %s.\n" name ;;
> 
> let o = open_out "filename";;
> output_string o name;;
> close_out o;;

A better (advanced) way is to do it the Lisp way: 

with_open_outfile "filename" (fun chan -> 
  output_string chan name
 );


where with_open_outfile is defined by:

let with_open_outfile filename f = 
 let chan = open_out filename in
 let res = f chan in
 begin
   close_out chan;
   res
 end

Everywhere where 2 functions must be balanced (here open and close), it is cleaner to introduce
a single higher-order function to enforce such a protocol.

You can also use a function  unwind_protect (again invented by the Lisp folk I think)
to  also automagically close the channel when  f raise an exception.