title: C# - How to take string and convert it to a Boolean expression so that the user can choose an option
body: <p>This is being programmed in c# as a console application.
  In my program, i intend to ask a user whether they want to find the area and voolume of a cuboid, the area and circumference of a circle or the area and volume of a sphere. I have the algorithms for the areas, volumes and circumference all set out, the only problem is that i do not know how to ask the user which one (the cuboid, circle and sphere) they want to do and then run only that specific algorithm.</p>