这就是我所拥有的,
doubleMe :: int->int
doubleMe x = x + x
当我在记事本++上运行它时
ghc hw.hs
Process started >>>
[1 of 1] Compiling Main ( hw.hs, hw.o )
hw.hs:1:1: The function main' is not defined in module `Main'
<<< Process finished.
================ READY ================
我如何使该程序具有交互性?