f# - 为什么 F# 在我的最后一行“disp”函数中发现错误？

Question

let disp xs (d:float) =
    match xs with
    | [] -> ' ' // return the space char
    | (a,b)::ts -> if(a > d)
                    then b // Found
                    else (disp ts d)

标签： f#

Answer 1

您需要使用以下命令指示递归函数rec：

let rec disp xs (d:float) =
    match xs with
    | [] -> ' ' // return the space char
    | (a,b)::ts -> if(a > d)
                    then b // Found
                    else (disp ts d)