[R] R interactive input like C++

[Erik Iverson]

?? wrote:
> Thank you for your reply.
> 
> My objective is simple. Assume  I have a constant vector, say Vector. in 
> C++ code, I want to do:
> 
> 
> int index;
> cout<<"Please enter the index of the element you want to look at Vector :";
> cin>>index
> cout<<Vector[index]
> 
> 
> I want every user to be able to do this.
> 
> As I understand, scan can only read data from a fixed file. Can I just 
> get the input from the shell directly?
> 

Isn't that what the file argument of ?scan says?  I think?

     file: the name of a file to read data values from.  If the
           specified file is ‘""’, then input is taken from the keyboard
           (or whatever ‘stdin()’ reads if input is redirected or R is
           embedded).