void

问题 Consider the following main() : int main(int argc, char *argv[]) { return (0); } Upon compilation with cc -Wall -Wextra , warnings saying "unused parameter" get generated. When I do not need to use a parameter in a function (for instance in a signal handler function that makes no use of its int parameter), I am used to doing the following: int main(int argc, char *argv[]) { (void)argc; (void)argv; return (0); } (For that particular main() , I sometimes see other people do: argv = argv - argc

问题 Consider the following main() : int main(int argc, char *argv[]) { return (0); } Upon compilation with cc -Wall -Wextra , warnings saying "unused parameter" get generated. When I do not need to use a parameter in a function (for instance in a signal handler function that makes no use of its int parameter), I am used to doing the following: int main(int argc, char *argv[]) { (void)argc; (void)argv; return (0); } (For that particular main() , I sometimes see other people do: argv = argv - argc

问题 What exactly is the difference between undefined and void 0 ? Which is preferred and why? 回答1: The difference is that some browsers allow you to overwrite the value of undefined . However, void(anything) always returns real undefined . undefined = 1; console.log(!!undefined); //true console.log(!!void(0)); //false 回答2: undefined has normal variable semantics that not even strict mode can fix and requires run-time look-up. It can be shadowed like any other variable, and the default global

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . Part A I'm trying to use the function that I have inside my base class "SHAPE" with the derived class "RECTANGLE" to create a bigger rectangle in my class "BIGRECTANGLE". I want to do have my sides transformation inside the class and not in the main, What should I do? Thanks! #include <iostream> using namespace

问题 I am trying to create a custom class for clicking pictures. Inside of it, I would like to create a clickPicture function that returns a UIImage . However, the captureStillImageAsynchronously is a void . How can I return the image I receive from that? Thanks. func clickPicture() -> UIImage? { if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo) { videoConnection.videoOrientation = .portrait stillImageOutput?.captureStillImageAsynchronously(from:

问题 Is the Most Vexing Parse rooted in the ambiguity about whether or not to use void as the parameter of a function declaration that takes no arguments? As an example, the following code compiles without error, and runs fine, on both the g++ (v7.2.1) and Xcode (Apple LLVM version 7.0.2 (clang-700.1.81)) compilers. #include <iostream> int asdf(void); int asdf(int a) { return a; } int main() { std::cout << asdf(6) << std::endl; //-> 6 return 0; } This goes all the way back to the ANSI-C standard

问题 This is where I get error: calcScore(double score1,double score2, double score3, double score4, double score5); here is the my code, I do not know how to fix the error; I am not sure what the error means. I've tried looking at examples in textbook, and online but I am still confused; this is first assignment where we have to use function #include <iostream> using namespace std; void getJudgesData(); void calcScore(); int main() { double scoreAverage=-9; double score1=-9.0; double score2=-9.0;

问题 I have this function in my interface and it creates a new PlayersBadge entry in the db. I have to write unit tests for and I'm stuck. public void Badge(int pID, int bID, int gID = 0) { var list = EliminationDbContext.PlayerBadges.Where(x=>x.Badge.BadgeID.Equals(bID) && x.Player.PlayerID.Equals(pID)); //if player doesn't have Badge create new Badge if (list.Any() != true) { PlayerBadge b = new PlayerBadge { PlayerID = pID, BadgeID = bID, DateEarned = DateTime.Today, GameID = gID };

问题 I am trying to write a class that find the closest two vectors and return a sum. I have tried to understand so hard but I can't find the reason why I get this message, it's the only error I get: java:93: incompatible types found : void required: EDU.gatech.cc.is.util.Vec2 result = one.add(two); ^ Line 93 is at the end of the code, I put some arrows to indicate it! enter code here package EDU.gatech.cc.is.clay; import java.util.*; import EDU.gatech.cc.is.clay.*; import java.lang.*; import EDU

问题 As I understand, C++ standard says that casting to void is correct only in case of function-style casting ( ISO/IEC 14882:2003, 5.2.3 ). But I can't find anything about C-style casting to void in C++ standard. Is behavior of program only implementation-defined in this case ? 回答1: As I understand, C++ standard says that casting to void is correct only in case of function-style casting No, it can be done by static_cast , and therefore also by conversions using functional or cast notation. But I