Hello, I am using Mozart Oz for an assignment at uni and am encountering a
problem with recursion. The two functions involved are below, I can't seem
to return a true or false value to the browser window. If someone could
point out where my logic falls apart I would appreciate it. Please do NOT
sent me optimization hints etc as this may lead me to place code I do not
fully understand into this assignment. I would like to keep this code as
clean and as very much my code as I can, but am really struggling to get my
head around the way Mozart Oz does things sometimes.
Thanks in advance.
Neil Munro
local L W R in
fun {Attack U V}
% First convert the co-ords into the actual location on the canvas.
% Get the Length and Width.
L = 993 div BoardSize
W = 650 div BoardSize
case U of XI#YI then
case V of XII#YII then
% This could be written using lazy orelse andthen keywords.
% However I do not fully understand how to use them correctly
% from the online Oz documentation.
if U.1 == V.1 then % Horizontal line.
R = true
elseif U.2 == V.2 then % Vertical line.
R = true
elseif ( XI - XII ) == ( YI - YII) then % Diagonal lines.
R = true
elseif ( XI - XII ) == ( YII - YI ) then
R = true
else
R = false
end
end
end
R
end
end
% This function will use {Attack} to determine
% if the list (L) {Threaten} is given can attack
% the position given in U.
fun {Threaten L U}
case L of H|T then
% If {Attack H U} is true, return true.
% Otherwise recurse with T and U as args.
{Attack H U} orelse {Threaten T U}
else
false
end
end
{Browse {Threaten [1#2 4#5 8#8] 8#4}}
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