Every time I change one of the terms, I run the test script, and as a result, a different set of Assertions pass while others fail. I’ve tried many different combinations of operators, like swapping the three instances of disjunctions and conjunctions, back and forth, one for the other. The problem involves basic predicate logic and bivalence. There is only one variable - a given year - but so many different possible cases and conditions that the unit test tries to verify. 1900 is not a leap year, but 2000 is.įor a delightful, four minute explanation of the whole leap year phenomenon, go watch this youtube video. Unless the year is also evenly divisible by 400įor example, 1997 is not a leap year, but 1996 is. Quote:on every year that is evenly divisible by 4Įxcept every year that is evenly divisible by 100 The tricky thing here is that a leap year in the Gregorian calendar occurs: Quote: Given a year, report if it is a leap year. Instead just provide guidance, hints, and support in a general direction. Although I'd prefer that you people not provide a full solution. Switch text/comments or Comments plus text).This is not for a course credit. If you want both, then there are modes in Structorizer that support a combined approach (e.g. If you want to test and export an algorithm, however, then of course you should adhere to the (still loose) syntactic recommendations. Still the text should be understood in a similar way: So if a condition is requested, the text should express a question or logical assertion. If you are just interested in a symbolic representation of an algorithm then you may fill in arbitrary text of a natural language or pseudo-code and ignore the syntactic explanations given in the subsections. Note: First of all the right choice and placement of elements is important. Just inspect the respective subsection for details. (An EXIT (Jump) element ( ) may also be used in certain cases to exit extraordinarily from a loop or a diagram, though it ought to be avoided.) You may "raise" (or "throw") an exception by means of an EXIT (Jump) element ( ). If you are an advanced programmer and want to model exception handling then you may use the non-standard TRY ( ) element. If you happen to have to do several sub-tasks, which are mutually independent and could be performed in arbitrary order or in parallel, then you may choose to make them branches of a PARALLEL ( ) element. ![]() If you have to repeat some bunch of operations, you'll need one of the loop elements: FOR ( / ), WHILE ( ), REPEAT ( ), or ENDLESS ( ) loop. If the further activities depend on a condition or selection, insert an IF ( ) or CASE ( ) statement. If you want to delegate complex operations to another diagram, insert a CALL ( ) instead. To perform some (more or less atomic) action you will use the basic element type: Instruction ( ). If you wanted to place the element before the selected element, you should just have held the shift button pressed while clicking on the element symbol in the toolbar.Įlements can also be created via menu " Diagram › Add" or the function keys listed among the key bindings. On committing, the filled-in element will be placed immediately after the previously selected element (see above). When you click on the respective element button, an input form ("element editor") will appear, allowing you to fill in the element text and some comment. ![]() In order to add an element you must have selected either an existing element in your diagram or the initially empty centre of your diagram. The body of any algorithm can be composed of up to ten standard types (plus an extra type) of elements all being offered in the element toolbar for insertion: The framing Program (or Subroutine or Includable) element will already be there. Here can you find explanations for the different kinds of elements that may be inserted into a Nassi-Shneiderman diagram and how to do this in Structorizer.
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