main

问题 It's definitely possible to execute code before main is called, as seen by many examples in this question. However, what if in that pre-main code, the program is told to exit via std::exit or std::abort ? Since main is defined as the start of a program, what consequences are there from exiting before the start? Upon printing something in each section, I get the following results: Format: Section : output Main : main Init (called before main) : init Exit (set up with std::atexit inside Init) :

问题 I would like to know if there is a simple way to access the main window or view in IOS. Something similar to: [UIScreen mainScreen] Thank you. 回答1: Try : UIWindow *frontWindow = [[[UIApplication sharedApplication] windows] lastObject]; or simply : UIWindow *frontWindow = [[UIApplication sharedApplication] keyWindow]; 回答2: The main window is best found using UIWindow * mainWindow = [UIApplication sharedApplication].windows.firstObject; Using keyWindow can return a keyboard or UIAlertView

问题 I saw a snippet of code on CodeGolf that's intended as a compiler bomb, where main is declared as a huge array. I tried the following (non-bomb) version: int main[1] = { 0 }; It seems to compile fine under Clang and with only a warning under GCC: warning: 'main' is usually a function [-Wmain] The resulting binary is, of course, garbage. But why does it compile at all? Is it even allowed by the C specification? The section that I think is relevant says: 5.1.2.2.1 Program startup The function

问题 I'm new to programming and currently I'm learning C programming. I'm writing codes on the code blocks and in it using GCC compiler. When I create a new project, (as you know it creates main.c file with it) and due to that I'm not able to compile another file in that project. File 1: #include<stdio.h> int main() { int a,b,c,d; printf("Enter three numbers\n"); scanf("%d%d%d",&a,&b,&c); d=a; if(b>d) d=b; if(c>d) d=c; printf("\n The maximum of three numbers is %d",d); } File 2: main.c #include

问题 I know this is fairly basic, but I'm still stuck. So I have a function that needs to take in a variable n, so this is my main function int main(int argc, char* argv){ sort(argv[1]); } And I'm calling the program like this: ./sort 4 <text.txt But the number 4 doesnt get recognized or passed into the function. What am I doing wrong? I know that argv[0] should hold the name of program itself and each one from there on should hold the arguments. 回答1: You should try to print them all. #include

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I need to call if __name__ == '__main__' , that calls several classes in one module, Module 1 , in a function, function1 , that's in a class in a second module, Module 2 . I can't use def main() - solution in Module 1 instead of if __name__ == '__main__' , since the module has several classes and

问题 This material says on page 10 that it is possible to run a JavaFX app without writing main . I suppose there is some predefined main inside jfxrt.jar which looks for a class extending Application and runs it. Is that so? How to do that? 回答1: I suppose there is some predefined main inside jfxrt.jar which looks for a class extending Application and runs it. This isn't really what's meant by that comment, and isn't how it works. All it is saying is that the "main class" doesn't need to define a

问题 I have a class named TestMaze . I have another class named DisplayHome which has a method called gameOver() : public void gameOver() { Console.Write("GAME OVER!"); Console.Write("Play Again? Y/N"); if(char.ToLower(Convert.ToChar(Console.Read())=='y') //Main() else Environment.Exit(1); } How can I call the Main method? PS. they have the same namespace. I just need to know how can I call the Main method again. 回答1: You should have a Play() method inside your Main... and GameOver() should call

问题 SOLVED, Program was in location with national symbol in it's path. I just started studying java, but every program i try to start (even example ones from my course) shows an error. Error: Could not find or load main class "Any class name of program I try start" C:\Users\Mine\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1 BUILD FAILED (total time: 0 seconds) edit: example of code, but happens to any code. public class Hello { static void hello(){ System.out

问题 This question already has answers here : Is main() overloaded in C++? (6 answers) Closed 2 years ago . Since C+++ allows function overloading, can we overload main() ? For example, int main(const std::string &) { return 0; } int main(int argc, char *argv[]) { return main("calling overloaded main"); } gcc-4.3.4 doesn't compile this, and gives these errors: (see at ideone) prog.cpp:4: error: first argument of ‘int main(const std::string&)’ should be ‘int’ prog.cpp:4: error: ‘int main(const std: