OpenEuphoria

RE: Uninitialized Variables

• Posted by Bernie Ryan <xotron at localnet.com> Mar 23, 2002
• 493 views

Chris Bensler wrote:
> I have thought of a way that we can determine if a variable is 
> uninitialized or not. We can also set it back to being uninitialized.
> 
> constant INF = (1e300*1e300),
> 
> integer  i   i = -INF
> atom     a   a = -INF
> sequence s   s =  INF
> object   o   o =  INF
> 
> I tried to use NAN as well, but everything is equal to NAN!?
> NAN=1
> NAN=-NAN
> NAN=INF
> NAN=-5039487
> 
> Is that proper behaviour?
> 

Chris:
   I don't think you understand what a uninitialized variable is.
   When a compiler or interpreter allocates a storage location
   to contain a variable. There is know way to know what that
   memory location contains. The variable is therefore
   called a unintialized variable. If the compiler or interpreter
   assigns a known value at creation time, then the variable
   is called a initialized variable. What you are doing above
   is assigning a known value to a uninitialized variable.
Bernie