[ifelse]命令/预期命令

Question

我是网络标志的初学者。在代码下面，似乎括号中有错误，但我没有发现我的错误.谢谢你的帮助。

to exit
ask turtles [[
[ifelse patch-here = goal ; option A
[ifelse pcolor = gray ; option B (option A1)
[ifelse income = 0 ;option C (option B1)
  [die] ;option C1
  [ifelse count products >= 3 ;option B2
    [die][set turtles continue]]] ;option C2 
[set turtles continue]
] ; option B2
  [set turtles continue]]
 ; option A2
]]end

Answer 1

当你找不出一个括号错误时，正确的缩进是你的朋友。这是您的代码：

to exit
ask turtles
[
  [
    [ ifelse patch-here = goal ; option A
      [ ifelse pcolor = gray ; option B (option A1)
        [ ifelse income = 0 ;option C (option B1)
          [die] ;option C1
          [ ifelse count products >= 3 ;option B2
            [die]
            [set turtles continue]
          ]
        ] ;option C2 
        [ set turtles continue
        ]
      ] ; option B2
     [ set turtles continue
     ]
   ]
 ; option A2

但您的问题是，您从ask turtles [ [ [开始--三个开头括号，其中应该有一个。