operator keyword - C# Custom Iterator Implementation

I have a class, say Myclass, with a list variable, say string list, which I want to call from outside Myclass object instance, in a loop, succinctly like: Myclass myclass = new Myclass();foreach (string s in myclass){}I suspect it uses the implicit operator keyword inside of Myclass on a property. Syntax grrr..! Any help?(Not sure if it's good practice but there are times when it comes in handy)....Read more

dafny - The Hilbert epsilon operator

Why you can use the Hilbert epsilon operator in a method and in a function, but not in a "function method"?method choose<T>(s:set<T>) returns (x:T)requires s != {}{var z :| z in s;return z;}function choose'<T>(s:set<T>):T// function method choose'<T>(s:set<T>):T // Activate this line and comment the previous line to see the errorrequires s != {}{var z :| z in s;z}...Read more

Does pyDatalog have a "cut" operator like prolog?

This may be quite simple, but i can't find the answer anywhere. In Prolog, when you want to prevent it from searching for additional answers, once a variable has already been instantiated, you can use the ! sign (usually called the "cut" sign).You can see it in this link to understand what i mean:http://www.learnprolognow.org/lpnpage.php?pagetype=html&pageid=lpn-htmlse44for example, given the rule:max(X,Y,Z) :- X =< Y,!, Y = Z.if we query:max(X,Y,X).the ! sign will prevent prolog from backtracking and trying to prove (X =< Y) ...Read more

Apama "within" and "and" operator not execute listener?

I'd like to build a simple monitor. Who listens for events in a time window and executes a listener. But the listener is not executed. I have a feeling the Apama Engine doesn't support that. From documentation:Temporal operations are a common requirement for CEP. For example, we may want to put a time limit on our expressions. The within operator specifies a time in seconds within which the expression must complete, starting from when a constituent template is first activated. The below expression is complete when we receive both a MyEvent and ...Read more

swift4 - Binary operator '<' cannot be applied to two 'Int?' operands

Good evening lovely community,this is my first post, please have mercy, if I do something wrong. I know there are some similar questions here, but I doesn't understand it.Maybe I understand, if someone explain it on my code.// these are my two TextFields and the "finish"-Button.@IBOutlet weak var goalPlayerOne: UITextField!@IBOutlet weak var goalPlayerTwo: UITextField!@IBOutlet weak var finishedGameButton: UIButton!// here are my function, it should tell me, which Player has won like A < B, so B has won. @IBAction func finishedGameButtonPres...Read more

how to use ternary operator to return a definite value or a block of code

I was testing out the ternary operator in javascript to see if this would work. I want the function to return 1 if the number is zero or run through the loop and return the factorial. I don't know why it isn't working. please check the code below.function factorialize(num) {return (num==0)?1: (for( i=num-1; i>0; i--){ num*=i console.log(num) } return num;)}factorialize(5);...Read more

What Is The Purpose of Negative Modulus Operator Results?

I was previously under the (naive) assumption that the modulus operator returned the remainder of division. I was apparently wrong, as -2 % 5 returns 3. I would have thought that 5 divides -2 zero times with -2 as the remainder.Now I understand the mechanics of how this operation is performed, but my question is why? Could someone give me a link to something that explains why modulus and remainder are not synonymous, or an example of a situation where it would be useful?...Read more

Right shift operator

I spent several hours today hunting for a bug until I foundsomething I don't understand.This is the code I've been working with:unsigned long k,l,m;k = 1000;l = 33;m = k>>l;It gives m=500 i.e. it apparently shifts by l mod 32!I have logically expected 0.Is this something I have just overlooked and never noticed?...Read more

Error: Operator is not a function - SML

I am in my first steps in programming and in SML, and I am trying to create a program. As a matter of fact, there are plenty of errors that occur.In this post I get the error: operator is not a functionI am new to functional programming, and it is difficult for me to understand the logic of the code below. Can I use multiple "val" declarations in "let", and is let/val/in used in pattern matching?fun action(_,_,[]) = ([],[]) |action(cin,cout,h::[]) = let val (s1,d1,d2) = (pass_cout(pass_cin h cin) cout, #1 (find2digits((pa...Read more

I get the following error Operator '==' cannot be applied to operands of type 'int' and 'string' password == "55555" is marked as an error

namespace if4{ class Program { static void Main(string[] args) { string username; int password = new int(); string userValue; userValue = Console.ReadLine(); Console.WriteLine("Enter your username:"); userValue = Console.ReadLine(); Console.WriteLine("Enter your password: "); if (username == "code" && password == "55555") { Console.WriteLine("Access allowed! "); Console.ReadLine(); ...Read more