RosettaCodeData/Task/Monads-Writer-monad/FreeBASIC/monads-writer-monad.basic
2024-04-19 16:56:29 -07:00

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Text

Type mwriter
value As Double
log_ As String
End Type
Function Unit(v As Double, s As String) As mwriter
Dim As mwriter mw
mw.value = v
mw.log_ = " " & s & ": " & Str(v) & Chr(10)
Return mw
End Function
Function Root(mw As mwriter) As mwriter
mw.value = Sqr(mw.value)
mw.log_ = mw.log_ & " Took square Root: " & Str(mw.value) & Chr(10)
Return mw
End Function
Function addOne(mw As mwriter) As mwriter
mw.value = mw.value + 1
mw.log_ = mw.log_ & " Added one : " & Str(mw.value) & Chr(10)
Return mw
End Function
Function Half(mw As mwriter) As mwriter
mw.value = mw.value / 2
mw.log_ = mw.log_ & " Divided by two : " & Str(mw.value) & Chr(10)
Return mw
End Function
Dim As mwriter mw1
mw1 = Unit(5, "Initial value ")
mw1 = Root(mw1)
mw1 = addOne(mw1)
mw1 = Half(mw1)
Print "The Golden Ratio is "; mw1.value
Print !"\nThis was derived as follows:-"
Print mw1.log_
Sleep