ClassCastException java.lang.Long 不能转换为 clojure.lang.IFn

问题描述

我有一个函数，它接受年数和薪水，然后递归地将薪水加倍，直到年数用完.但是，我不断收到此错误:

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 不能转换为 clojure.lang.IFn

代码

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

我对 Clojure 非常陌生，所以我确信它很简单，但我似乎无法弄清楚.

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

这个错误的含义应该不难理清:一个数字被用在了需要函数的地方.

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.如果您将 (salary) 更改为 salary，您将返回该数字，而不是尝试将其作为无参数函数调用.

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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