For the answer to the question above, <span>A </span>plumb bob<span>, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or </span>plumb<span>-line. It is essentially the vertical equivalent of a "water level".</span>
Interpreting I know of at least sign language the state is requiring you to be certified in order to have that occupation.
A double is best used for numbers that are real, as in they have a decimal. Int is best used for numbers that are whole, as in no decimal. Strings are best used, as in the example you gave, when you have to represent a piece of information that isn’t strictly numbers
