It’s just a function. Import it and call it: import myModule myModule.main() If you need to parse arguments, you have two options: Parse them in main(), but pass in sys.argv as a parameter (all code below in the same module myModule): def main(args): # parse arguments using optparse or argparse or what have you if … Read more
Yes, argv[argc]==NULL is guaranteed. See C11 5.1.2.2.1 Program startup (my emphasis) If they are declared, the parameters to the main function shall obey the following constraints: The value of argc shall be nonnegative. argv[argc] shall be a null pointer. Providing argc therefore isn’t vital but is still useful. Amongst other things, it allows for quick … Read more
You are reading the sentence incorrectly. A program shall contain a global function called main, which is the designated start of the program. The standard is DEFINING the word “start” for the purposes of the remainder of the standard. It doesn’t say that no code executes before main is called. It says that the start … Read more
It’s simply using the “old-style” function-declaration syntax; you’re implicitly declaring an int parameter called vooid.
The Main() method is created automatically. If you want to provide your own you have to (tested in VS2013, VS2017 and VS2019): Right-click App.xaml in the solution explorer, select Properties Change ‘Build Action’ to ‘Page’ (initial value is ‘ApplicationDefinition’) Then just add a Main() method to App.xaml.cs. It could be like this: [STAThread] public static … Read more
The main function must be declared as a non-member function in the global namespace. This means that it cannot be a static or non-static member function of a class, nor can it be placed in a namespace (even the unnamed namespace). The name main is not reserved in C++ except as a function in the … Read more
EXIT_FAILURE, either in a return statement in main or as an argument to exit(), is the only portable way to indicate failure in a C or C++ program. exit(1) can actually signal successful termination on VMS, for example. If you’re going to be using EXIT_FAILURE when your program fails, then you might as well use … Read more
public class J { public static void main(String[] args) { String main = “The character sequence \”main\” is an identifier, not a keyword or reserved word.”; System.out.println(main); } } This compiles, and when executed, emits this output: The character sequence “main” is an identifier, not a keyword or reserved word. The character sequence main is … Read more
In Java args contains the supplied command-line arguments as an array of String objects. In other words, if you run your program in your terminal as : C:/ java MyProgram one two then args will contain [“one”, “two”]. If you wanted to output the contents of args, you can just loop through them like this… … Read more
This is just convention. In fact, even the name main(), and the arguments passed in are purely convention. When you run java.exe (or javaw.exe on Windows), what is really happening is a couple of Java Native Interface (JNI) calls. These calls load the DLL that is really the JVM (that’s right – java.exe is NOT … Read more