OpenEuphoria

Re: goto's, and loops

• Posted by "Lucius L. Hilley III" <lhilley at CDC.NET> Jul 30, 1999
• 811 views

WARNING: Pseudo-code follows.

A goto statement has two uses.

1. skip code.

  integer h -- file handle
  h = open("somefile", "r")
  if h = -1 then --file not opened
    goto Skip
  end if
  load_opened_file()

  :Skip
  do_other_things()

2. repeat code.

  :Repeat
    puts(1, "This keeps printing...")
  goto Repeat


Skip code can be accomplished with of the following if statements.
    if flag then
      do_code()
    end if

    if flag then
      do_code()
    else
      do_other_code()
    end if

    if flag1 then
      do_code1()
    elsif flag2 then
      do_code2()
    end if

    if flag1 then
      do_code1()
    elsif flag2 then
      do_code2()
    else
      do_other_code()
    end if

Repeat code is handled with a while loop.

  while 1 do
    do_code()
    if exit_now then
      exit
    end if
    do_more_code()
  end while

the exit can be placed anywhere and will only exit
that loop.  The only way to exit nested loops is with
flags for each loop.

integer end_loop1, end_loop2, end_loop3

end_loop1 = repeat(0, 3)

while 1 do --loop1
  while 1 do --loop2
    while 1 do --loop3
      end_loop1 = 1
      exit
    end while --end_loop3
    if end_loop1 or end_loop2 then
      exit
    end if
  end while --end_loop2
  if end_loop1 then
    exit
  end if
end while --end_loop1



        Lucius L. Hilley III
        lhilley at cdc.net   lucius at ComputerCafeUSA.com
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