OpenEuphoria

Re: strange error

• Posted by Larry D Poos <ldpoos at JUNO.COM> Jun 28, 1997
• 725 views

On Sat, 28 Jun 1997 03:26:56 -0500 James Powell <wizard at DJO.COM> writes
about:
Subject:      strange error

>I've come across a small error in a program I am writing.  I am trying
>to scan an incomming buffer for known characters, and came up with the
>following code:

>Attempt to redifine iBufPos
>       FoundAt = find(iBuffer[iBufPos], Chars)
>             ^
>From the Library.Doc  about find(x,s)
Description: Find x as an element of s. If successful, return the index
              of the first element of s that matches. If unsuccessful
              return 0.

You could also say Find x in s where x is a member of the sequence s.
Your code is trying to find s in x.

Rewrite as FoundAT=find(Chars,iBuffer).

 FoundAt will contain the position of Chars if found and 0 if not. If
iBuffer is a sequence of sequences then you will have to step though it
recursively to locate the Chars variable.

Here is a short example of how Find works. It is not written in tight
code the hope of showing how find(x,s) works. I am just a beginner with
Euphoria so I hope I this is clear enough.

Larry D. Poos
-[USMC (Retar{bks}{bks}ired) Havelock, NC]-
- Programming and System Consultant, LTAD Enterprises -
e-mail: ldpoos at juno.com
Fido: 1:3629/101.6

---------------- Begin plain text code segment ------------
with trace
-- initialize testing variables
sequence iBuffer
object FoundAt, SearchFor,tempbuf
SearchFor=3 -- you can change this number to any number 10 or less
iBuffer={}
-- build some data sequences
for x=1  to 10 do
    tempbuf={}
    iBuffer=append(iBuffer,{x})
    for y=7  to 10 do
        tempbuf=append(tempbuf,rand(y))
    end for
    iBuffer[x]=append(iBuffer[x],tempbuf)
end for
-- show what we are searching
?iBuffer
puts(1,"\n")

-- the meat of the search
trace(1) -- watch how it works
for x=1  to length(iBuffer) do -- loop through each segment
    for y=1  to length(iBuffer[x])  do -- loop through the subsegments
        tempbuf=iBuffer[x][y] -- temp storage for what we are going to
test
        if atom(tempbuf) then -- ensure test item is a sequence
            tempbuf={tempbuf}
        end if
        FoundAt=find(SearchFor,tempbuf) -- look for test item
        if FoundAt then -- display search results
            printf(1,"%g Found in iBuffer[%d][%d] at position %d\n",
            {SearchFor,x,y,FoundAt})
        else
            printf(1,"Item not Found in iBuffer[%d][%d]\n",{x,y})
        end if
    end for
end for
---------------- End plain text code segment ------------