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haskell - Haskell 第二天怎么找？

问题描述

-- | Days of week.
data Day = Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday deriving (Eq, Show)

-- | Returns the next weekday (excluding weekend, namely Saturday and Sunday).
nextWeekday :: Day -> Day
nextWeekday day = 
  if x == Sunday
    then let x = Monday
  if x == Monday 
    then let x = Tuesday
  if x == Tuesday
    then let x = Wednesday
  if x == Wednesday
    then let x = Thursday
  if x == Thursday
    then let x = Friday
  if x == Friday
    then let x = Saturday
  else
    then let x = Sunday

这是我现在的代码......这个代码有什么问题......？如何自动缩进 Haskell 代码？

标签： haskell

解决方案

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