如何耗尽全局变量？

Question

我需要一些关于如何完全使用全局变量的指导。

我有全局变量

num-tourists 

，它是有多少游客来到某个地方的数字。

然后，我让我的海龟获得最大数量的游客（15），并收取 100,000 的费用。我的每个卖家最多可以接待 15 名游客。

ask turtles with [turism = 1]
      [set earnings (earnings + ((15) * 100000))]
[set num-tourists num-tourists - 15]

但是，我不知道如何告诉代码，如果少于 15 个，它可以取剩下的，然后乘以 100000

Answer 1

这类似于 NetLogo 库中的“走向目标示例”。从功能上讲，您想要： 计算剩余游客的数量。如果该数字大于 15，则乘以 10000 X 15。否则，乘以 10000 X（剩余 n 个游客）。这是一种方法：

globals [num-tourists total-earnings]

to setup
  ca
  set num-tourists 40
  set total-earnings 0
  print (word "There are " num-tourists " tourists")
  reset-ticks
end

to go
  ifelse num-tourists > 15 [
    set total-earnings total-earnings + (15 * 10000)
    set num-tourists num-tourists - 15
  ] [
    set total-earnings total-earnings + (num-tourists * 10000)
    set num-tourists num-tourists - num-tourists
    ; equivalently, set num-tourists 0
  ]
  print (word "There are " num-tourists " tourists, and the total earnings are " total-earnings)  
  tick
end