OpenEuphoria

Re: atom() ambiguity

• Posted by Lewis Townsend <keroltarr at HOTMAIL.COM> Jun 19, 1998
• 520 views

Hello Alan,

>the second line here means:
>If the variable "line" is an atom then...
>Well, atom returns something.  Should this line be
>if atom(line) = 1 then
>This is because couldn't you write
>if atom(line) = 0 then
>Maybe if atom(line) then is a shorthand, but I don't think it is a
>good one
>because it is ambiguous.
>
>--Alan

    if atom(line) then
and
    if atom(line) = 1 then --(or 0)
are two different types of statements

if atom(line) returns 1 then
    if atom(line) then
would be the same as:
    if 1 then

1 means TRUE and 0 means FALSE so
    if 1 then
would execute the if statment and
    if 0 then
would skip over the if statement

however

    if atom(line) = 0
would execute the if statement if
line is not an atom and not if it is

You could say that
    if atom(line) then
is a shorter way to say
    if atom(line) = 1 then
but be careful that you know the difference
before you use them interchangably.

This is IMHO of course so I suppose there
could be other explanations.

Lewis Townsend
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