compiler-construction

问题 I am trying to write a function that will check if an object exists: bool UnloadingBay::isEmpty() { bool isEmpty = true; if(this->unloadingShip != NULL) { isEmpty = false; } return isEmpty; } I am pretty new to C++ and not sure if my Java background is confusing something, but the compiler gives an error: UnloadingBay.cpp:36: error: no match for ‘operator!=’ in ‘((UnloadingBay*)this)->UnloadingBay::unloadingShip != 0’ I can't seem to figure out why it doesn't work. Here is the declaration for

问题 I am trying to write a function that will check if an object exists: bool UnloadingBay::isEmpty() { bool isEmpty = true; if(this->unloadingShip != NULL) { isEmpty = false; } return isEmpty; } I am pretty new to C++ and not sure if my Java background is confusing something, but the compiler gives an error: UnloadingBay.cpp:36: error: no match for ‘operator!=’ in ‘((UnloadingBay*)this)->UnloadingBay::unloadingShip != 0’ I can't seem to figure out why it doesn't work. Here is the declaration for

问题 I am trying to write a function that will check if an object exists: bool UnloadingBay::isEmpty() { bool isEmpty = true; if(this->unloadingShip != NULL) { isEmpty = false; } return isEmpty; } I am pretty new to C++ and not sure if my Java background is confusing something, but the compiler gives an error: UnloadingBay.cpp:36: error: no match for ‘operator!=’ in ‘((UnloadingBay*)this)->UnloadingBay::unloadingShip != 0’ I can't seem to figure out why it doesn't work. Here is the declaration for

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question I realize that this question will raise some eyebrows, and I realize that JavaScript is traditionally an interpreted language, please let me explain: I am software engineer specializing in web applications (.NET stack specifically). As a hobby, I enjoy

问题 I have a grammar that works and parses in the Irony console just fine, but I don't get anything in the AST treeview. I was following along with the BASIC->Javascript article found here: http://www.codeproject.com/Articles/25069/JSBasic-A-BASIC-to-JavaScript-Compiler, but it seems that the Ast stuff has all been moved/removed. I found the Irony.Interpreter .dll, which has some Ast stuff in it, but it seems all tied up in the Expression sample implementation. What am I missing here? I want to

问题 I'm trying to create a script to compile an Windows Forms C# 2.0 project from the command line (I know, I know.. I'm reinventing the wheel.. again.. but if somebody knows the answer, I'd appreciate it). The project is a standard Windows Forms project that has some resources and references a couple external assemblies. Here is a list of the files: Program.cs // no need to expand on this on :) frmMain.cs // this is a typical C# windows forms file frmMain.designer.cs // .. and the designer code

问题 I'm trying to create a script to compile an Windows Forms C# 2.0 project from the command line (I know, I know.. I'm reinventing the wheel.. again.. but if somebody knows the answer, I'd appreciate it). The project is a standard Windows Forms project that has some resources and references a couple external assemblies. Here is a list of the files: Program.cs // no need to expand on this on :) frmMain.cs // this is a typical C# windows forms file frmMain.designer.cs // .. and the designer code

问题 I recently uninstalled Xcode 4.2 and re-installed Xcode 4.3.1. Installed Command Line Tools also. The error says 'C compiler doesn't work`. On searching for this error, it said that it happens when Xcode is not installed. What am I missing? rvm install 1.9.3 --with-gcc=clang Installing Ruby from source to: /Users/ava/.rvm/rubies/ruby-1.9.3-preview1, this may take a while depending on your cpu(s)... ruby-1.9.3-preview1 - #fetching ruby-1.9.3-preview1 - #extracting ruby-1.9.3-preview1 to /Users

问题 I recently uninstalled Xcode 4.2 and re-installed Xcode 4.3.1. Installed Command Line Tools also. The error says 'C compiler doesn't work`. On searching for this error, it said that it happens when Xcode is not installed. What am I missing? rvm install 1.9.3 --with-gcc=clang Installing Ruby from source to: /Users/ava/.rvm/rubies/ruby-1.9.3-preview1, this may take a while depending on your cpu(s)... ruby-1.9.3-preview1 - #fetching ruby-1.9.3-preview1 - #extracting ruby-1.9.3-preview1 to /Users

问题 I made a program that asks for 3 integers to output type of triangle. Everything runs and compiled successfully, however, it seems the part where it asks the user to see if they want to loop it again, the online compiler outputs the error: Exception in thread "main" java.util.NoSuchElementException at java.util.Scanner.throwFor(Scanner.java:838) at java.util.Scanner.next(Scanner.java:1347) at Assignment5.main(Assignment5.java:56) import java.util.Scanner; public class Assignment5 { public