syntax

问题 I was trying to compile a program with cmake , and I ended up deleting my main.cpp file, which I had just compounded into another file which held the name of my project (i.e., I just cut and pasted the main function into that one). The problem is that I got a main.cpp not found error, and wasn't sure whether or not in C++ a file known as main.cpp is required, or can I have a file with a different title which contains the function main instead? Edit I should note that I have removed any

问题 This question already has answers here : What is the purpose of the single underscore “_” variable in Python? (5 answers) Closed 6 years ago . I saw somewhere about the _ character being used in Python like: print _ Can somebody help me explain what it does? 回答1: In the interactive interpreter, _ always refers to the last outputed value: >>> 1 + 1 2 >>> print _ 2 >>> 2 + 2 4 >>> print _ 4 >>> In normal Python 1 code however, _ is just a typical name. You can assign to it as you would any

问题 This question already has answers here : What is the purpose of the single underscore “_” variable in Python? (5 answers) Closed 6 years ago . I saw somewhere about the _ character being used in Python like: print _ Can somebody help me explain what it does? 回答1: In the interactive interpreter, _ always refers to the last outputed value: >>> 1 + 1 2 >>> print _ 2 >>> 2 + 2 4 >>> print _ 4 >>> In normal Python 1 code however, _ is just a typical name. You can assign to it as you would any

问题 Say that I have a function that looks like: def _thread_function(arg1, arg2=None, arg3=None): #Random code Now I want to create a thread using that function, and giving it arg2 but not arg3. I'm trying to this as below: #Note: in this code block I have already set a variable called arg1 and a variable called arg2 threading.Thread(target=self._thread_function, args=(arg1, arg2=arg2), name="thread_function").start() The above code gives me a syntax error. How do I fix it so that I can pass an

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . Improve this question I'm getting an error Query failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '5,7,6,9,13 ORDER BY n.date DESC' at line 5. Can anyone point out what's wrong? Thanks $news

问题 I have an object DataParameterInfo (DPI) with a couple of delegate methods that are used to move data from a DataReader into a POCO or to get values out of the POCO. Example: new DataParameterInfo<IBulletinPCN> { FieldName = "ChangeProcedure", ParameterName = "@ChangeProcedure", EntityName = "ChangeProcedure", DataType = SqlDbType.NVarChar, FieldType = FieldType.Other, PopulateEntity = (dr, e) => e.ChangeProcedure = dr.IsDBNull(dr.GetOrdinal("ChangeProcedure")) ? null : dr.GetString(dr

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago . Improve this question So first of all, I know there is a bunch of answers here already relating this question, but I couldn't find the right one for my problem. When trying to create an object i basically just get this error. If any answers, thanks in advice. Here's my code: class Human: __name =

问题 I encountered this snippet in some example code. It works fine, but I got a linter error saying that it should be structured as an if-let statement. match event { glutin::Event::WindowEvent { event, .. } => match event { glutin::WindowEvent::Closed => return glutin::ControlFlow::Break, glutin::WindowEvent::Resized(w, h) => gl_window.resize(w, h), _ => (), }, _ => () } This was my attempt to restructure it: if let _ = glutin::Event::WindowEvent { event, .. } { match event { glutin::WindowEvent

问题 Please see image below: How can I modify the syntax so as to be able to assign specific values to specific cells in the array? 回答1: You cannot assign values in the class body, unless you write it in initialiser block or constructor. So write in the block as mentioned below or assign in constructor. public class Maze{ private int maze[][] = new int[5][5]; //Changing the value using initializer block { maze[1][1] = 1; } //Changing the value using constructor public Maze(){ maze[1][1]=5; }

问题 Consider this code: (function a() { // Nested function function b() { console.log("Works!"); } b(); })(); This code works, but would it be possible (in theory) to call b() if the name is inside a string (i.e. dynamic)? If b() would be declared in the global scope, we could use window[stringContainingName](); . Is there a possibility in this case? This is only a theoretical question! I know that such code is bad design. 回答1: This code works, but would it be possible (in theory) to call b() if