IfElse嵌套不起作用

Question

请检查此代码。哪部分是错的

to catch-lizards
    let prey one-of lizards-here
    ifelse prey = "lizard2"
    [ show "WRONG" ask prey [die]
     set lifetime = lifetime + hawks-life-gain ]
    [ifelse droping-tail? = true
    [ask prey [set shape "lizard2"
    set lifetime lifetime + hawks-life-gain / 4 ] ]
    [ask prey [die]
    set lifetime lifetime + hawks-life-gain ]
   ]
  ]
end

问题出现在哪里（显示“错误”）被写入。那部分不执行。语法不正确吗？

Answer 1

在ifelse prey = "lizard2"部分中，您可以比较prey 是否字符串lizard2。但是猎物不是字符串，它是具有某些属性的对象，如shape或lifetime。

所以你需要问一下猎物的形状是lizard2。

更新：检查猎物的形状可能如下所示：

ask prey [
  ifelse shape = "lizard2" [
    …
  ] [
    …
  ]
]