Christopher Dicely wrote:
I'm a complete newbie trying to get a handle on Mozart/Oz (running on
Windows XP Home, if that matters), so I've been trying some basic little
programs to get a feel of it; one I tried to do was a fairly common kind
of thing -- writing a program that outputs its command line arguments,
reversed (both in reverse order of the arguments, and reversing the
letters of each argument). If I do this:
functor
import
Application
System
define
for X in {List.reverse {Record.toList {Application.getGuiArgs
plain}}.1} do
{System.printInfo {List.reverse X}#" "}
end
{Application.exit 0}
end
Your program is wrong! It should not work at all, in fact. If you
check the documentation, you will see that {Application.getGuiArgs
plain} returns a *list* of strings, while Record.toList converts a
*record* to a *list*. Your program seems to work fine because Oz' lists
are records.
Let us analyse your program on an example. Assume that you call your
program followed by "hello world". {Application.getGuiArgs plain} will
thus return ["hello" "world"], which is the same as the record
'|'("hello" '|'("world" nil)). Applying Record.toList will therefore
return ["hello" '|'("world" nil)]. You then select the fist element
with ".1", and reverse it. So the loop is done on the string "olleh",
which happens to be a list.
The fix is easy: {Application.getArgs plain} returns the list of the
arguments. Simply reverse it, and traverse it.
functor
import
Application System
define
for Arg in {Reverse {Application.getArgs plain}} do
{System.printInfo {Reverse Arg}#" "}
end
{System.showInfo ""}
{Application.exit 0}
end
Cheers,
raph
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