[plt-scheme] How to insert an element in empty list?

jerzy.karczmarczuk at info.unicaen.fr wrote:

> All this, and Matthias pedagogical answer in particular, remind me times
> when I used Fortran; I remember one implementation on a CDC mainframe,
> where the user *could* corrupt numerical constants, for example making that
> a constant 1 (stored in memory, not an assembly-level literal...) became
> equal to 2. What a mess it could produce, you can hardly imagine...

It all makes sense now...

   The primary purpose of the DATA statement is to give names to
   constants; instead of referring to pi as 3.141592653589793 at every
   appearance, the variable PI can be given that value with a DATA
   statement and used instead of the longer form of the constant.  This
   also simplifies modifying the program, should the value of pi change.
       - FORTRAN manual for Xerox Computers

-- 
Jens Axel Søgaard