Haskell/Solutions/Variables and functions

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Exercises
Explain how GHCi evaluates `quadruple 5`. Define a function that subtracts 12 from half its argument.

quadruplex=double(doublex)
quadruple5=double(double5)
quadruple5=double10
quadruple5=20

subtractHalfx=x/2-12

Exercises
Write a function to calculate the volume of a box. Approximately how many stones are the famous pyramids at Giza made up of? Use GHCi for your calculations.

volumeBoxwhd=w*h*d

One approach for the Giza problem is starting from the pyramid volume and the estimated stone volume. Using general functions for the task, that might look like this in GHCi:

Prelude> let volumeBox w h d = w * h * d -- Just as above.
Prelude> let volumeSquarePyramid b h = b * b * h / 3
Prelude> volumeSquarePyramid 230.4 146.5 / volumeBox 1 1 1
2592276.48

Exercises
Write a function to calculate the volume of a cylinder.

volumeCylinderrh=h*arear

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