boolean-logic | 易学教程

How to use FINDSTR in PowerShell to find lines where all words in the search string match in any order

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The following findstr.exe command almost does what I want, but not quite: findstr /s /i /c:"word1 word2 word3" *.abc I have used: /s for searching all subfolders. /c: Uses specified text as a literal search string /i Specifies that the search is not to be case-sensitive. *.abc Files of type abc. The above looks for word1 word2 word3 as a literal , and therefore only finds the words in that exact order . By contrast, I want all words to match individually , in any order (AND logic, conjunction) . If I remove /c: from the command above, then lines matching any of the words are returned (OR logic

Should I use “&&” or “and”? [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm using C++11 and both are compiling without any warning, witch one is the best way to do it? if(a && b) or if(a and b) 回答1: 2.6

Passing a bool as a param. C++

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问题 what I am trying to do is an example below. let's first define a bool. bool cat = {false}; lets make a fake bool here. bool setcat(bool booltoset) { booltoset = true; return booltoset; } now lets call it with cat. printf("cat is %s", cat?"true":"false"); //set cat as false. my question is; is it possible to actually pass a bool through an argument than set that bool? 回答1: You need to pass by reference, i.e.: void setcat(bool& booltoset) { booltoset = true; } 回答2: Any function argument is just

is there ever a use for primitive variables in javascript?

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问题 a pretty simple question, is there ever a case where using a primitive data-type is preferable in javascript, i am specifically bothered by primitive booleans, consider the following code var bool = new Boolean(false); if (bool){ alert(bool); } it will alert but you will get false , which is kinda confusing ( false != falsy). so is there ever a point in using primitive data-types and especially primitive booleans? 回答1: The primitive values are very useful (ex of primitive values: true, false,

Can this boolean expression be simplified?

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问题 (A Or B) And Not (A And B) 回答1: You're looking for a XOR, depending on the language it may be a single operation. 回答2: It is XOR (See table below). A B (A|B) (A&B) !(A&B) (A|B)&(!(A&B)) T T T T F F T F T F T T F T T F T T F F F F T F You can also use not equal operation like (A != B) . Hope this helps. 回答3: isn't this just an exclusive or? sometimes indicated by this syntax: A ^ B 回答4: If you have Xor or equality in your atomic operations, yes, it is exactly the former or the negation of the

C# How do I check if one of two values is TRUE?

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问题 Should be a simple question for the C# experts here. I basically want to check if one value or another is TRUE, a wild stab at the code is below: if ((Boolean.Parse(staff.getValue("Male")) | Boolean.Parse(staff.getValue("Female"))) { // is true } Is this correct? Thanks 回答1: If EXACTLY ONE should be true then it is: var male = bool.Parse(staff.getValue("Male")); var female = bool.Parse(staff.getValue("Female")); if (male ^ female) { //is true } 回答2: Sounds like you're looking for the logical

How to convert “0” and “1” to false and true

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问题 I have a method which is connecting to a database via Odbc. The stored procedure which I'm calling has a return value which from the database side is a 'Char'. Right now I'm grabbing that return value as a string and using it in a simple if statement. I really don't like the idea of comparing a string like this when only two values can come back from the database, 0 and 1. OdbcCommand fetchCommand = new OdbcCommand(storedProc, conn); fetchCommand.CommandType = CommandType.StoredProcedure;

What is an appropriate data structure and database schema to store logic rules?

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问题 Preface: I don't have experience with rules engines, building rules, modeling rules, implementing data structures for rules, or whatnot. Therefore, I don't know what I'm doing or if what I attempted below is way off base. I'm trying to figure out how to store and process the following hypothetical scenario. To simplify my problem, say that I have a type of game where a user purchases an object, where there could be 1000's of possible objects, and the objects must be purchased in a specified

Cleaner Alternative to Extensive Pattern Matching in Haskell

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Right now, I have some code that essentially works like this: data Expression = Literal Bool | Variable String | Not Expression | Or Expression Expression | And Expression Expression deriving Eq simplify :: Expression -> Expression simplify (Literal b) = Literal b simplify (Variable s) = Variable s simplify (Not e) = case simplify e of (Literal b) -> Literal (not b) e' -> Not e' simplify (And a b) = case (simplify a, simplify b) of (Literal False, _) -> Literal False (_, Literal False) -> Literal False (a', b') -> And a' b' simplify (Or a b) = case (simplify a, simplify b) of (Literal True, _)

Should I use “&&” or “and”? [closed]

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As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. I'm using C++11 and both are compiling without any warning, witch one is the best way to do it? if(a && b) or if(a and b) BoBTFish 2.6 Alternative tokens [lex.digraph] 1 Alternative token representations are provided for some operators and punctuators.16 2