在F#中使用浮点型(双精度类型)进行模式匹配

let checkValue (value: float) =
    match value with
    | 0.0 -> printfn "The value is zero."
    | x when x > 0.0 -> printfn "The value is positive."
    | x when x < 0.0 -> printfn "The value is negative."
    | _ -> printfn "Invalid value."

checkValue 0.0 // 输出：The value is zero.
checkValue 10.5 // 输出：The value is positive.
checkValue -5.2 // 输出：The value is negative.
checkValue 2.3e-5 // 输出：The value is positive.