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函数程序设计实验十:车牌竞价信息处理

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{-
文件bids_201711.txt 是广州市某月车牌竞价信息,包含若干行,每行形如「1234198004118085   29570」,表示一位竞价人的身份证号和出价。
假设本月有10个车牌竞拍。你的任务是统计相关信息,包括最高成交价、最低成交价、平均成交价、按照出价从高到低列车前十位出价人身份证号和出价,并存入另一个文件bidResults.txt中。例如,统计结果可能如文件bidResults1.txt  所示。
要求:
1. 提交你的代码文件;
2. 提交统计结果文件,或者将结果粘贴在提交窗口。
提示:需要排序函数,请hoogle :: [a] -> [a],或者自定义排序。
-}
--代码写的太丑了,以后重写吧……

import Data.Char
import System.IO
import Text.Printf

main::IO()
main= do
    txt<-readFile "bids_201711.txt"
    let dat=lines txt
    let mi=getmin dat
    let ma=getmax dat
    let sum=getsum dat
    let len=length dat
    let aftersort=getsort dat
    writeFile "bidResults.txt"
        (printf "最高成交价:%d\n最低成交价:%d\n平均成交价:%d\n总共有%d参与竞价成交名单:\n%s"
            ma mi (div sum len) len (unlines (take 10 aftersort)))

digit::String->Int->Int
digit s n=(ord (s!!n))-(ord '0')

getval::String->Int
getval s=(digit s 23)*10000+(digit s 24)*1000+(digit s 25)*100+(digit s 26)*10+(digit s 27)

getmin::[String]->Int
getmin [a]=getval a
getmin (x:xs)=if a<b then a else b
    where
        a=getmin [x]
        b=getmin xs

getmax::[String]->Int
getmax [a]=getval a
getmax (x:xs)=if a>b then a else b
    where
        a=getmax [x]
        b=getmax xs

getsum::[String]->Int
getsum [a]=getval a
getsum (x:xs)=(getmax [x])+(getmax xs)

getsort::[String]->[String]
getsort []=[]
getsort (x:xs)=(getsort [y|y<-xs,(getval y)>(getval x)])++[x]++(getsort [y|y<-xs,(getval y)<(getval x)])

下面是bidResults.txt的内容。

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最高成交价:29995
最低成交价:10008
平均成交价:111
总共有491参与竞价成交名单:
1234198610248103       29995
1535198004062143       29948
1334197907229015       29922
1435198110019109       29916
1535198412072052       29822
1533198811246245       29820
1633197706227256       29815
1234198205229019       29799
1533198710186071       29777
1536198405206083       29727

下面是bids_201711.txt的内容。

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