list - 如何将列表写入文件？

Question

我在尝试:

import System.IO
saveArr = do
    outh <- openFile "test.txt" WriteMode
    hPutStrLn outh [1,2,3]
    hClose outh

但它不起作用......输出:

No instance for (Num Char) arising from the literal `1'

编辑
好的 hPrint使用整数但数组中的浮点数呢？ [1.0, 2.0, 3.0] ?

Answer 1

hPutStrLn只能打印字符串。也许你想要 hPrint ?

hPrint outh [1,2,3]