c,performance,if-statement,boolean-logic,strcmp

Unless there are known performance issues with one approach vs another, always prefer the approach that is easier to read and understand. Given your three choices, I would most definitely go with: if ( strcmp(mystring,"y")==0 || strcmp(mystring,"yes")==0 ) { something(); } Update You can define a macro that will help...

Which gate it is That circle with a plus sign i.e ⊕, is known as Exclusive OR gate. It is an OPERATION of OR gate. Value for this Gate Its value is true, if either one is true and the second is false. If both of the inputs are true...

Never quite figured out what was wrong with the original circuit (don't have the time) but replacing test.v with the description below allowed the simulation to finish and produce correct results. /* Verilog model */ module test(EN, CLK, CD, Q0, Q1); input EN, CLK, CD; output Q0, Q1; wire CAI,...

hardware,boolean-logic,computer-architecture

You can't just shop for nand gates, those are ones used for hobbies or other markets, nand gates are in your processor in your computer, and they're not individual component but directly lithographied on the die, they are a few nanometers in size and there are billons of them on...

java,boolean,boolean-logic,logical-operators

The bitwise negation-operator is ~. Example: int i = 6; System.out.println(~i); // Prints -7 If you want to treat the integer as an unsigned 16-bit integer (i.e. disregard from the most significant 16 bits) you should do public static int u16neg(int i) { return ~i & 0xFFFF; } Example: System.out.println(u16neg(0b00000000_00000000_00000000_00000110));...

python,list,list-comprehension,boolean-logic

You can use all and a generator expression: all(1 in x for x in (a, b, c, d)) Demo: >>> a = [1 ,2] >>> b = [1, 3] >>> c = [1, 4] >>> d = [2, 5] >>> all(1 in x for x in (a, b, c, d))...

If d is your DataFrame: >>> d['B'] = ((d.A.shift(2)==1) & (d.A.shift(1)==1)).astype(int) >>> d A B 0 1 0 1 1 0 2 0 1 3 0 0 4 1 0 5 1 0 6 0 1 7 0 0 8 0 0 shift is the way to shift a column...

python,numpy,subset,boolean-logic

You can use numpy.logical_and: >>> c1[np.logical_and(c2==2, c3==3)] array([9, 5]) ...

You're nearly there, you need enclosing brackets to group as a capture group and to handle numbers other than those 2 digits long. /([0-9]+\s{0,1}(X|x))|((X|x)\s{0,1}[0-9]+)/g Paste it into http://regexr.com/ to try it out. I tested it with: X9847 X 2645 4442 x x 525521 5254X5541 221 X 266 ...

Based on De Morgan's Law your condition !(!a || b) can be simplified like (a && !b) cause negataion mark as ! !(!a) will become a !(||) will become && !(b) will become !b...

javascript,loops,if-statement,while-loop,boolean-logic

Am I missing a key fundamental idea that IF statements ignore boolean values of FALSE? Yes, you are. This is the entire point of if. In most languages, if statements follow the following pattern: if (expression) then {statements} with the then being implied, rather than typed out, in many...

This is the same as going from disjunctive normal form to conjunctive normal form. There is a guide on math stack exchange that highlights doing this with double negation, De Morgan's Law's, and distributive laws. Dr Math provides a trick for performing this conversion at the bottom of his reply...

python,coding-style,language-lawyer,boolean-logic,conditional-operator

That is perfectly valid and you can use that. Even the documentation of or has an example for the same. Note that neither and nor or restrict the value and type they return to False and True, but rather return the last evaluated argument. This is sometimes useful, e.g., if...

logic,computer-science,transitions,boolean-logic

Your finite state machine has one state bit and one output bit. Therefore you can distinguish four different r/y states: r y ---- 0 0 0 1 1 0 1 1 From each of these states the machine will transition to a subsequent state depending on the input bit x....

This is a bit of a trick question. Consider applying De Morgan's law to the expression on the left, after applying a double negation: !!(!b && (c || !d)) !(b || !(c || !d)) !(b || !c && d) In other words, there is no such combination because the two...

jquery,boolean-logic,boolean-expression

I modified your code a bit. Now you can have x number of players in the array and they will switch their states just fine. I commented the most important parts so I don't think you will have problem reading the code. If you have just ask :) JSFiddle: http://jsfiddle.net/ycycghwq/2/...

Depending on the class/method requirements, you could possibly reverse your logic: if (!done) { Console.WriteLine("Not done!"); done = true; } ...

Create a function to evaluate to evaluate the inclusion and exclusion criteria: --This function evaluates the expression and return 1 for match, 0 or no match. --Assumption: There are no nulls. create or replace function is_match(p_inclusion varchar2, p_exclusion varchar2) return number is v_sql varchar2(32767); v_count number; begin --Create SQL statement...

c,while-loop,formatting,boolean-logic

If scanf fails when reading an integer, the input buffer needs to be cleared of the character causing the failure. The scanset "%*[^\n]" scans and discards characters that are not newline. A newline is left in the input buffer but the %d format specifier will skip leading whitespace. #include <stdio.h>...

python,list-comprehension,boolean-logic

You have two errors in your code. If the last element is 13, then the first element with not be added because lst[0-1] == 13 because of Python's index wrap around. As stated in the comments and in the other answer, you should be using and, instead of or. This...

php,boolean-logic,negation,boolean-algebra

As you can see in the doc operators in PHP have different priorities. It means:! applied to $test first. According to the doc, empty string '' or '0' will be converted to false, otherwise true. It is not the same. When $test equals to empty string '' or '0'...

java,multithreading,boolean-logic,slick2d

while(graphic.m = false), in addition to being a spinlock and thus a Bad Thing, is an assignment to graphic.m and will always be immediately false. Using while(graphic.m == false) will make your code "correct" but still Bad. Using while(!graphic.m) is a little less bad, but using a better waiting strategy...

c#,textbox,return-value,boolean-logic,registrykey

Try This - comments are inline. I assumed that code retrieving keys is correct. Also remember, that different systems have different registry keys, so you will need to create logic to recognize which system you running it on and then go through possible locations, and you may also need create...

algorithm,data-structures,implementation,boolean-logic,binary-decision-diagram

Beginning at the root node, traverse tree in depth-first manner. For each leaf node reached, record an entry in truth table as follows: x1 is 0 if you descended the dashed edge from node x1; 1 otherwise. x2 is 0 if you descended the dashed edge from node x2; 1...

javascript,boolean,boolean-logic

The expression operands to && are evaluated left to right. The value of the && expression is the value of the subexpression last evaluated. In your case, that'll be the right-most expression in both cases. So, with (true && {}), the && operator first evaluates true. It's not falsy, so...

javascript,mongodb,meteor,mongodb-query,boolean-logic

You could implement this logic with the findOne() method which finds the first document that matches the selector/query object in the arguments. Thus you can call findOne() with a Mongo selector, which is an object that specifies a required set of attributes of the desired document to match a document....

sql,postgresql,boolean-logic,operator-precedence

As long as NULL values are not ruled out, your description must be translated to something like this: UPDATE gamebet SET points = 15 WHERE game = 8 AND "scoreT1" > "scoreT2" AND ("scoreT1" = "scoreT2" + 1 AND "scoreT1" = 1) IS NOT TRUE; The additional condition "scoreT2" =...

excel,excel-2010,boolean-logic,named-ranges

Description of AND function (MS link): Syntax AND(logical1, [logical2], ...) The AND function syntax has the following arguments: logical1 Required. The first condition that you want to test that can evaluate to either TRUE or FALSE. logical2, ... Optional. Additional conditions that you want to test that can evaluate to...

python,condition,boolean-logic

or and and both use short-circuiting; they will only evaluate as many conditions as necessary to determine a result. So, if 'string1' in a returns True, 'string2' in a will never be touched.

python,boolean-logic,boolean-expression

Quoting Python documentation, The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned. The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and...

You already answered the question yourself: The difference is the precedence. Ruby reads if !char =~/\W/ as if (!char) =~/\W/ What is obviously never true. Where as: if not char =~/\W/ is interpreted as if !(char =~/\W/) ...

php,algorithm,boolean-logic,boolean-expression

It's almost scary to say out loud, but you found one of those rare cases where eval is actually a valid solution instead of a problem on its own. Just 'compiling' your input to PHP will make your life a thousand times easier. For example: $code = 'return '; foreach($keys...

javascript,boolean,switch-statement,boolean-logic

I don't think I'd do that. But if you really want to, you can use boolA + " " + boolB: switch(boolA + " " + boolB){ case "false false": [do something]; break; case "false true": [do something else]; break; case "true false": [do another thing]; break; default: // "true...

c#,resharper,boolean-logic,roslyn

isStaticProperty is initialized outside the loop: var isStaticProperty = propertySymbol.IsStatic; If isStaticProperty is false, then this expression: (isStaticConstructor && isStaticProperty) is always false, hence hasStaticUsage is false. If isStaticProperty is true, then this expression: (!isStaticConstructor && !isStaticProperty) is always false, hence hasInstanceUsage is false. In any case hasStaticUsage and hasInstanceUsage...

r,matrix,dataframes,boolean-logic

Assuming you have a test matrix like mm <- structure(c(1, 0.4, 0.4, 0.1, 0.9, 0.4, 1, 0.4, 0.4, 0.1, 0.4, 0.4, 1, 0.1, 0.3, 0.1, 0.4, 0.1, 1, 0.1, 0.9, 0.1, 0.3, 0.1, 1), .Dim = c(5L, 5L), .Dimnames = list(c("A", "B", "C", "D", "E"), c("A", "B", "C", "D", "E")))...

boolean,naming-conventions,boolean-logic,boolean-operations

An expression like "true AND false" is called a contradiction. It always results in false. The truth table of such an expression has nothing but false/zero values as output. An alternative term is paradox. The opposite is called tautology, an expression or formula which always results in true....

algorithm,encryption,boolean-logic,boolean-expression

NAND is an irriversible operation: a b (a NAND b) 0 0 1 0 1 1 1 0 1 1 1 0 If b is 0 and you know that the result of (a NAND b) is 1, you cannot know whether a is 0 or 1. Hence, your encryption...

They are almost synonymous, but not quite. The difference is that ! has a higher precedence than not, much like && and || are of higher precedence than and and or. ! has the highest precedence of all operators, and not one of the lowest, you can find the full...

python,django,many-to-many,boolean-logic

You could make a CompoundRequirement which has some number of requirements that it ORs together (with a ManyToManyField) and then each class has some Requirements and some CompoundRequirements. ANDs are handled by having more than one requirement, so all you need to handle is ORs.

Is there any instance > would change to <= ? Answer: every time you negate it. Consider x > 1. The negation of this is clearly x <= 1. If you simply negate it as x < 1 then neither case covers the x == 1 case. That being...

python,python-2.7,boolean,boolean-logic,boolean-expression

obh.val_1 is "gnd" compares the two objects in memory if they are the same object. Python sometimes interns strings in order to reuse them if they are identical. Using "is" to compare strings will not always have predictable results. In another sense, you sort of called id(obh.val_1) == id("gnd") #id...

javascript,angularjs,boolean-logic

Let's break down your logic. Always hide the item if the item is in a different folder than the currently viewed folder item.isInCurrentFolder If the condition is not met, we won't be even testing any further. If the "must be starred" filter is applied, and the item is starred, show...

In your original question, you say you'd like the result to be a data frame, but the result, res, you show is actually a matrix. Therefore, my first result below is a matrix, and then I convert it to a data frame with as.data.frame(). This can be done fairly easily...

boolean-logic,boolean-expression

Take a look at this: (a + b)(b' + c)(a + c) = (ab' + 0 + ac + bc)(a + c) = (ab' + ab'c +ac + ac + abc + bc) = (ab' + ab'c + ac + abc + bc) = (ab'(1+c) + ac + bc(a +...

java,if-statement,boolean-logic

Your if statement is a little off: String partValueContentType = part.getContentType(); System.out.println(partValueContentType); if (!(partValueContentType.equals("image/jpeg") || partValueContentType.equals("image/jpg") || partValueContentType.equals("image/gif") || partValueContentType.equals("image/png"))) { FacesMessage msg = new FacesMessage("File is not an image.", "Acceptable image types (jpeg, jpg, gif, png)"); msg.setSeverity(FacesMessage.SEVERITY_ERROR); throw new ValidatorException(msg); } In terms of validation, you might want to...

Only if you have made a function for this.. this is what will probably work best: List<myClass> myList = new ArrayList<myClass>(); myList.add(______); //add every element upon creation foreach (myClass myItem: myList) //for each myItem of type myClass within myList { if (__condition__) { __action__ break; } } Should work like...

As my hint in the question, this can be achieved more elegantly with a custom accumulate function: rule "odd" when accumulate($l : Integer(), $r : reverseSort($l); $r.size > 2, ($r[0] % 2) == 1, ($r[1] % 2) == 1, ($r[2] % 2) == 1) then System.out.println("Best 3 are odd numbers:...

excel,excel-formula,boolean-logic

If I understand you correctly, simply: D2: =SUMIF($A$1:$C$1,"Y",A2:C2) and fill down. The absolute reference style for range will prevent those references from changing as you fill down, whereas the relative reference style for sum_range will allow those to change to the proper row....

if(a.equals(b)){ found = true }else { found = false; } This is your problem. This way only the last iteration of your loop will be stored in found. Since you are initializing it as false you don't need to set it to that again here. for (int i = j+1;...

c#,exception,design,boolean-logic

Exceptions should be thrown when exceptional circumstance occur or a usage error is encountered, i.e. null parameter In your case it would be better to just return false.

python,indexing,pandas,boolean-logic

see the discussion here: https://github.com/pydata/pandas/issues/1134 this was originally a feature, though the reasons for supporting are not necessary anymore (Series has not been a ndarray subclass for quite a while) I did try to fix this a while back but it opened a whole host of issues. As always would...

r,search,boolean,boolean-logic,boolean-operations

For convenience, record the length of the number of thresholds n = length(list_n) Represent the vector of TRUE and FALSE as a run-length encoding, remembering the length of each run for convenience r = rle(TFvec); l = r$length Find possible starting locations idx = which(l >= list_n[1] & r$value) Make...

All Python objects have a boolean value; numeric 0 is considered false, every other number is true. So 0 is false, 6 is true, and not 0 or 6 evaluates to True because not 0 is True: >>> not 0 True See Truth Value Testing in the Python documenation: Any...