Transcript
arq :: IO (),,
"arq = do putStr ""Digite o nome do arquivo de entrada:
ifile <- getLine
putStr ""Digite o nome do arquivo de saida: ",,
ofile <- getLine,,
s <- readFile ifile,,
writeFile ofile s,,
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type Cents = Int,,
type PriceList = [(String,Cents)],
type ShoppingList = [(String,Cents,Cents)]
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readShoppinList :: IO ShoppingList,,
"readShoppinList = do putStr ""Digite um item de compra:
item <- getLine
if item == ""
then return []
else do putStr ""Quantidade = ",,
q <- readLn,,
" putStr ""Preco Unit =
p <- readLn
items <- readShoppinList
return ((item,q,p):items)
gravaArq :: IO ()
gravaArq = do g <- readShoppinList
putStr ""Digite o nome do arquivo de gravacao: ",,
ofile <- getLine,,
writeFile ofile (show g),,
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valorPagar:: IO (),,
"valorPagar = do putStr ""Digite o nome do arquivo:
fnome <- getLine
g <- readPriceList fnome
let c = calcPag g
print c
calcPag::ShoppingList->Int
calcPag [] = 0
calcPag ((x,y,z):xs) = (y*z) + calcPag xs
type File = String
readPriceList :: File -> IO ShoppingList
readPriceList fname = do cs <- readFile fname
print cs
return (read cs)
contaItens:: IO ()
contaItens = do putStr ""Digite o nome do arquivo: ",,
fnome <- getLine,,
g <- readPriceList fnome,,
let c = conta g,,
print c,,
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conta::[a]->Int,,
conta [] = 0,,
conta (x:xs) = 1 + conta xs,,
