What are the semantics of choice and fail statements?

(a) a choice statement allows alternatives to be explored, while a fail statement indicates no answer at that branch.
(b) there are no choice and fail statements in oz.
(c) a choice statement displays a search tree, while a fail statement indicates a unification failure.
(d) a choice statement indicates no answer at that branch, while a fail statement allows alternatives to be explored.

[a] create a class called “cycle” which has two instance integer variables as properties, “numberofwheels” and “weight.” create a constructor with two parameters, using the same variable names in the parameter list. assign each variable to numberofwheels” and “weight” respectively. write a separate application to test the class and display its properties. note: do not change the names of the instance variables or the variables listed in the constructor’s parameter list. [b] edit your class cycle by adding a default constructor which will assign the default values of 100 to represent the numberofwheels, and 1000 to represent the weight, by invoking a call to the other constructor. modify your application created in [a] to test the class.

Which type of tab stop is most for weights and measurements?

You draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck. (a) are the outcomes on the two cards independent? why?