theory

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . As far as I'm aware, the default value of a boolean variable in C#, VB, Java and JavaScript is false (or perhaps "behaves like false"

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . As far as I'm aware, the default value of a boolean variable in C#, VB, Java and JavaScript is false (or perhaps "behaves like false"

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . As far as I'm aware, the default value of a boolean variable in C#, VB, Java and JavaScript is false (or perhaps "behaves like false"

问题 It seems to me that a lot of my debugging time is spent chasing down null-reference exceptions in complex statements. For instance: For Each game As IHomeGame in _GamesToOpen.GetIterator() Why, when I get a NullReferenceException, can I get the line number in the stack trace, but not the name of the object that equals null. In other words, why: Object reference not set to an instance of an object. instead of _GamesToOpen is not set to an instance of an object. or Anonymous object returned by

问题 Of course this is an impossible statement in java (to-date), however ideally I would like to implement it as it is at the heart of many iterations. For example the first multiple times it is called I'm doing it 650,000+ times when it is creating the ArrayList . Unfortunately the reality is that my actual code does not have the set inside the else loop; thus it will pass over both the add and then the set commands and wasting time. After that I have it also in another loop where it is only

问题 Of course this is an impossible statement in java (to-date), however ideally I would like to implement it as it is at the heart of many iterations. For example the first multiple times it is called I'm doing it 650,000+ times when it is creating the ArrayList . Unfortunately the reality is that my actual code does not have the set inside the else loop; thus it will pass over both the add and then the set commands and wasting time. After that I have it also in another loop where it is only

问题 I am currently taking the Scala course on Coursera on my free time after work, in an attempt to finally give a try to functional programming. I am currently working on an assignment where we are supposed to "calculate" the union of two sets that contain some object. I am intentionally omitting details as it's not really important to what I am trying to ask here. What is relevant, however, is that the sets are defined as binary trees, with each node containing an element, and two subtrees.

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . For about 2 months I've been reading everything I can find for these 3 topics and I'm not yet sure I got it. Dependency Inversion

问题 I've always been told that adding an element to an array happens like this: An empty copy of the array+1element is created and then the data from the original array is copied into it then the new data for the new element is then loaded If this is true, then using an array within a scenario that requires a lot of element activity is contra-indicated due to memory and CPU utilization, correct? If that is the case, shouldn't you try to avoid using an array as much as possible when you will be

问题 I'm working with a couple of AI algorithms at school and I find people use the words Fuzzy Logic to explain any situation that they can solve with a couple of cases. When I go back to the books I just read about how instead of a state going from On to Off it's a diagonal line and something can be in both states but in different "levels". I've read the wikipedia entry and a couple of tutorials and even programmed stuff that "uses fuzzy logic" (an edge detector and a 1-wheel self-controlled