ClassCastException java.lang.Long不能转换为clojure.lang.IFn [英] ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn

问题描述

我有一个函数，需要的年数和薪水，然后递归加倍的薪水，直到几年用尽。但是，我一直收到此错误：

I have a function that takes the number of years and salary, then recursively doubles the salary until years is exhausted. However, I keep getting this error:

ClassCastException java.lang.Long无法转换为clojure.lang.IFn

ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn

代码

(defn calculate-salary
    [years salary]
    (if (= years 0)
        (salary)
        (calculate-salary (- years 1) (* salary 2))))

我对Clojure很新，所以我确定它的东西很简单，

I'm very new to Clojure so I'm sure its something simple, but I just can't seem to figure it out.

推荐答案

错误的意思不应该太难理解：数字

The error's meaning shouldn't be too hard to sort out: a number is being used where a function is expected.

Clojure中的括号不是分组结构，它们主要用于调用函数调用。如果将（salary）更改为 salary ，您将返回该数字而不是尝试将其调用为无参数函数。

Parenthesis in Clojure are not a grouping construct, they are used primarily to invoke function calls. If you change (salary) to salary you will return the number rather than attempting to call it as a no-argument function.

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