global-variables

问题 I want to have some custom configuration (read in from file) available throughout my C# Windows Forms application. Is the concept of say: creating a static class, e.g. "public static class GlobalData" loading from the "Load" action of the main form event How does this sound? Is this the best practice way to do it? 回答1: As others have stated, you can use AppSettings to store simple data. The basics are easy; going beyond them is hard (see App.Config and Custom Configuration Sections). You can

问题 I am new to Objective C with a background primarily in database programming. I am developing an iPhone medical application that involves multiple formulas for calculations, using many variables. Essentially each formula will have its own screen, but numeric entries and calculations from each screen should appear on the screens for other formulas that share common entries, as the user navigates between screens, and variable values changed on one screen should update if appearing on another

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . In C/C++, are global variables as bad as my professor thinks they are? 回答1: The problem with global variables is that since every function has access to these, it becomes increasingly hard to figure out which functions actually read and write these variables. To understand

问题 I'm trying to understand the ways in which a C global variable can be shared between multiple files (compilation units). I've read the excellent question and answer here. However after doing a few tests I'm still left with some stuff I don't get: Basically my question would be: if there's a variable declared (but not defined) in a header WITHOUT the extern keyword, is it ok to simply include that header in various compilation units in order to make available that variable to all those

问题 I'm trying to understand the ways in which a C global variable can be shared between multiple files (compilation units). I've read the excellent question and answer here. However after doing a few tests I'm still left with some stuff I don't get: Basically my question would be: if there's a variable declared (but not defined) in a header WITHOUT the extern keyword, is it ok to simply include that header in various compilation units in order to make available that variable to all those

问题 Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and Chrome: For a given HTMLElement with ID in the DOM tree, it is possible to retrieve the div using its ID as the variable name. So for a div like <div id="example">some text</div> in Internet Explorer 8 and Chrome you can do: alert(example.innerHTML); //=> 'some text' or alert(window['example'].innerHTML); //=> 'some text' So, does this mean every element in the DOM tree is converted to

问题 from random import randint shifts = [4, 4.2, 5, 6, 7] days_names = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday'] workers_names = ['Itai', 'Or', 'Reut', 'Kuka', 'Aviel'] counter = 1 def shift_arrange(worker): for day in days.values(): counter+=1 global avilable_shifts avilable_shifts = check_avilable_shifts(day) if not random_shifte_selector(worker,day): soft_reset(worker) I set counter as a global variable, and when i try to run this code i get the local variable error: Traceback

问题 I'm running into an issue where a global variable isn't "remembered" after it's modified in 2 different functions. The variable df is supposed to be a data frame, and it doesn't point to anything until the user loads in the right file. This is similar to something I have (using pandas and tkinter ): global df class World: def __init__(self, master): df = None .... def load(self): .... df = pd.read_csv(filepath) def save(self): .... df = df.append(...) save() is always called after load() .

问题 Recently I manged to embed LUA in my C application, what I'm trying to do now is thatI have a value (Session_ID) I want to pass from C function to a LUA script, so that it can be used by LUA script to Call a function back in C. I have no problem loading LUA script in C and running it (using lua_pcall), and I have no problem as well to call the C function from inside LUA, my current problem is passing global variable back and forth. For example: At C side (test.c): session_id = 1; luabc_sz =

问题 The recursive setTimeout function getRandomProducts is called onload in the html body tag, and so is constantly iterating. The function setCategoryTree is being called onclick from the links in a nested ul of a navigation-bar. This function then passes the variable mainCategory to getRandomProducts, in which the variable is declared globally to maintain its' initialization. ...So, what I am trying to do is reset the getRandomProducts function when a link is clicked in the navigation-bar, and