伙计们请告诉我为什么这不是编译
putStrLn("The average number of fans for the films of " ++ actor ++ " is : " ++ printf "%.2f\n" (show(countAveFans actor testDatabase))
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它很简单但我不能想为什么它不起作用.我尝试将整个事物转换为字符串并取出2小数点打印出来.谢谢
haskell ×1