[英]Prolog If Then Else fail with member predicate
Hello guys I am working on a prolog game and I need to write a piece of code that will: 大家好,我正在开发序言游戏,我需要编写一段代码来:
Then I have a list that is named TempBoard and it looks like this: 然后,我有一个名为TempBoard的列表,看起来像这样:
([
(1,1,-,-),(1,2,-,-),(1,3,-,-),(1,4,-,-),
(2,1,-,-),(2,2,-,-),(2,3,-,-),(2,4,-,-),
(3,1,-,-),(3,2,-,-),(3,3,-,-),(3,4,-,-),
(4,1,-,-),(4,2,-,-),(4,3,-,-),(4,4,-,-)
]).
before I add this (X,Y,w,ArmyNO) to the list I first want to check it if it is already there. 在将此(X,Y,w,ArmyNO)添加到列表之前,我首先要检查它是否已经存在。
I attempted to do that by using this code but it does not seem to work properly: 我试图通过使用以下代码来做到这一点,但它似乎无法正常工作:
%#######Got the number####
repeat,
%Get Cordinates X & Y.
writelist( [TempBoard,'select coordinates for the horizontal axis 1 to 4 to place your soldier Mr. Human',nl]),
read(X),
writelist(['select coordinates for the vertical axis 1 to 4 to place your soldier Mr. Human',nl]),
read(Y),
%Check if they are in the list.
(
member( (X,Y,w,ArmyNo),TempBoard ) ->
( replace((X,Y,w,ArmyNo),TempBoard,NewBoard) ) ;
(
writelist(['selected positions are not available in the table Mr.Human',nl]) , fail
)
).
%%
(X, Y, w, ArmyNo)
cannot be unified with any member of your example list because w
doesn't unify with -
. 无法与示例列表的任何成员统一,因为
w
不能与-
统一。 You may have meant W
. 您可能是说
W
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