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问题 This question already has answers here : What should main() return in C and C++? (17 answers) Closed 4 years ago . Why do we need to use int main and not void main in C++? 回答1: The short answer, is because the C++ standard requires main() to return int . As you probably know, the return value from the main() function is used by the runtime library as the exit code for the process. Both Unix and Win32 support the concept of a (small) integer returned from a process after it has finished.

问题 This question already has answers here : What should main() return in C and C++? (17 answers) Closed 4 years ago . Why do we need to use int main and not void main in C++? 回答1: The short answer, is because the C++ standard requires main() to return int . As you probably know, the return value from the main() function is used by the runtime library as the exit code for the process. Both Unix and Win32 support the concept of a (small) integer returned from a process after it has finished.

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is the clojure equivalent of the Python idiom “if name == 'main'”? I would use -main , but it only runs in compiled mode, not interpreted mode. I would use (if (.isAbsolute (java.io.File. *file*)) (main *command-line-args*)) , but that runs during any (load) ing of scripts. 回答1: Duplicate of What is the clojure equivalent of the Python idiom "if __name__ == '__main__'"?. I guess I'm supposed to "vote to

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is the clojure equivalent of the Python idiom “if name == 'main'”? I would use -main , but it only runs in compiled mode, not interpreted mode. I would use (if (.isAbsolute (java.io.File. *file*)) (main *command-line-args*)) , but that runs during any (load) ing of scripts. 回答1: Duplicate of What is the clojure equivalent of the Python idiom "if __name__ == '__main__'"?. I guess I'm supposed to "vote to

问题 I'm new to Java and haven't yet learned how to create 2 separate classes and combine them and so, I end up jumbling everything in the main and you can imagine how the code end up looking not understandable, which I plan to learn later on in my course. Yet I need a solution to work with 'Methods' so my code can look cleaner and if I need to add to it or repair it wouldn't be much of a hassle. So basically my question is whether I can use Hashmap.get from the main to get information from a

问题 So I already know why this error happens, inside the SDL_main.h file a 'main' macro is being created, which will cause problems with your actual main function. It's just that none of the obvious workarounds seem to be helping me. I have tried: Defining my main function with (int argc, char* argv[]). Tried it with C linkage like the comments in SDL_main.h suggest: * The application's main() function must be called with C linkage, * and should be declared like this: * \code * #ifdef __cplusplus

问题 I was going through the difference in C and C++ and I found a tricky point. Can you please elaborate the below points: In C, we can call main() Function through other Functions. In C++, we cannot call main() Function through other functions. How to call main() from another function and what is the use case of it? 回答1: @TrevorHickey hit the nail on the head (where did his answer go?) - C++ forbids calling main from within a different function (for good reason)... Not that any compiler is

问题 I simply represent the curves of Average Total Costs, Average Variable Costs, Average Fixed Costs and Marginal Costs. plot(Q,ATCosts,ylab=NA,ylim=c(0,62),type="l") par(new=T) plot(Q,AVCosts,ylab=NA,ylim=c(0,62),type="l",col="blue") par(new=T) plot(Q,AFCosts,ylab=NA,ylim=c(0,62),type="l",col="red") par(new=T) plot(Q,MCosts,ylab=NA,ylim=c(0,62),type="l",col="green") The main is: title(main="ATC,AVC,AFC,MC") What I would like to know is if there is a way to give each piece of the main

问题 Sorry but I'm having a major brain fart here (guess that's what a few days of little sleep get you). Without changing anything to static how can I make a main() that will run this. package merger; import java.util.Random; public class another { public int[] numbers; private final static int size = 100; private static int maxNumber = 30; private final static int limit = 10; public int number; private boolean Insertion = false; public void arraytosort(){ numbers = new int[size]; Random number =

问题 A quick question I hope. I would like to know why the line commented out below causes an error when placed at the global level while it works fine when placed inside the main function? Many Thanks #include <iostream> using namespace std; bool compare(const int &v1, const int &v2) { if (v1 < v2) { return true; } else { return false; } } bool (*pf5)(const int &v1, const int &v2); //pf5 = compare; int main() { int v1 = 5; int v2 = 6; pf5 = compare; bool YesNo1 = compare(v1, v2); cout << YesNo1 <