C++ – char** argv vs. char* argv[]
They are entirely equivalent. char *argv[] must be read as array of pointers to char and an array argument is demoted to a pointer, so pointer to pointer to char, or char **. This is the same in C.
program-entry-point
How does this C program compile and run with two main functions?
Quoting ld(1): The linker will search an archive only once, at the location where it is specified on the command line. If the archive defines a symbol which was undefined in some object which appeared before the archive on the command line, the linker will include the appropriate file(s) from the archive. When linking 2main, … Read more
“Error: Main method not found in class MyClass, please define the main method as…”
When you use the java command to run a Java application from the command line, e.g., java some.AppName arg1 arg2 … the command loads the class that you nominated and then looks for the entry point method called main. More specifically, it is looking for a method that is declared as follows: package some; public … Read more
Does int main() need a declaration on C++?
A definition of a function is also a declaration of a function. The purpose of a declaring a function is to make it known to the compiler. Declaring a function without defining it allows a function to be used in places where it is inconvenient to define it. For example: If a function is used … Read more
Could not find or load main class with a Jar File
I got it working like this: TestClass.Java package classes; public class TestClass { public static void main(String[] args) { System.out.println(“Test”); } } Use javac on the command line to produce TestClass.class. Put TestClass.class in a folder classes/. MANIFEST.MF Manifest-Version: 1.0 Main-Class: classes.TestClass Then run jar cfm test.jar MANIFEST.MF classes/ Then run it as java -jar … Read more
Is main() overloaded in C++?
ยง3.6.1/2 (C++03) says An implementation shall not predefine the main function. This function shall not be overloaded. It shall have a return type of type int, but otherwise its type is implementation-defined. All implementations shall allow both of the following definitions of main: int main() { /* … */ } int main(int argc, char* argv[]) … Read more
Why main() in C++ cannot be inlined?
In C++ it is not legal to call the main function in your code, so there’d be no way it could ever be inlined.
Multiple Main Functions
In Java, the computer determines the “entry point” when you actually execute the program, not when you compile. For example, from the command-line java MyClass searches for main() in MyClass. All other main() functions are ignored. If you are using an IDE, then you can set which class contains the main() function that you want … Read more
Using Spring 3 autowire in a standalone Java application
Spring works in standalone application. You are using the wrong way to create a spring bean. The correct way to do it like this: @Component public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext(“META-INF/config.xml”); Main p = context.getBean(Main.class); p.start(args); } @Autowired private MyBean myBean; private void start(String[] args) { … Read more
How to access global variables
I would “inject” the starttime variable instead, otherwise you have a circular dependency between the packages. main.go var StartTime = time.Now() func main() { otherPackage.StartTime = StartTime } otherpackage.go var StartTime time.Time