definition

问题 I have need to extract the real and imaginary elements of a complex number in python. I know how to make a list into a complex number... but not the other way around. I have this: Y = (-5.79829066331+4.55640490659j) I need: Z = (-5.79829066331, 4.55640490659) and I will also need each part if there is a way to go directly without going by way of Z: A = -5.79829066331 B = 4.55640490659 https://docs.python.org/2/library/functions.html#complex Thanks! 回答1: Y = (-5.79829066331+4.55640490659j) Z =

问题 I'm currently working on some quite old C++ code and often find things like int i; i = 42; or Object* someObject = NULL; someObject = new Object(); or even Object someObject; someObject = getTheObject(); I completely understand what this code does but I really have no idea when such a separation of variable definition and initialization could be helpful. I searched for some explanations but always ended up with member initialization lists or the question when you should define your local

问题 I'm currently working on some quite old C++ code and often find things like int i; i = 42; or Object* someObject = NULL; someObject = new Object(); or even Object someObject; someObject = getTheObject(); I completely understand what this code does but I really have no idea when such a separation of variable definition and initialization could be helpful. I searched for some explanations but always ended up with member initialization lists or the question when you should define your local

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 . If someone were to say something happens in the first or last week of some month, how would you define that span? Background I'm

问题 It occurred to me today that although I've adopted and don't infrequently use the term "semantics" when referring to language elements and naming conventions, I don't have any sense of a formal definition. My attempt to find a formal definition in the programming domain made my eyes glaze over. I have a sense of its meaning from the contexts in which I've encountered it, and from its more common usage with respect to linguistics, and I typically use the term to refer to the meaning or

问题 I encountered this word for the first time in the StackOverflow question "C# Theoretical: Write a JMP to a codecave in asm." I see that according to Wiktionary, a code cave is: an unused block of memory that someone, typically a software cracker, can use to inject custom programming code to modify the behavior of a program. Did I find the correct definition? If so, is there any legitimate use for a code cave? 回答1: I've used them, although I'd never heard the term code cave until today. The

问题 I just noticed that in the wikipedia page of Ruby, this language is defined as interpreted language. I understood that probably there's something missing in my background. I have always known the difference between an interpreted language that doesn't need a compiler and a compiled language (who require to be compiled before the execution of programs), but what characterize a scripting language ? Is Ruby definable as a scripting language ? Thank you and forgive me for the black out 回答1:

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . Can somebody please explain to me what an activity, a context and an intent in Android are? I read the Android documentation, but I could not understand these concepts. 回答1: Activity : represents the presentation layer of an Android application, e.g. a screen which the user sees.

问题 I often read that lazy is not the same as non-strict but I find it hard to understand the difference. They seem to be used interchangeably but I understand that they have different meanings. I would appreciate some help understanding the difference. I have a few questions which are scattered about this post. I will summarize those questions at the end of this post. I have a few example snippets, I did not test them, I only presented them as concepts. I have added quotes to save you from

问题 Can someone clarify the meaning of these terms? Are tracked files any files that have, at some point, been added to the stage? Is the "index" the same as the "stage"? Are all staged files tracked, but the reverse is not necessarily true (namely, files that were once staged and committed, but aren't part of the current stage to be committed)? How do I know which files are tracked? How do I know which files are staged? 回答1: There are three things to consider here: the current commit (known