Recent questions tagged boolean

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boolean - What's the difference between Array{Bool} and BitArray in Julia and how are they related?

I was writing a function for boolean 2d arrays: function foo(A::Array{Bool,2}) ... end Evaluating and testing it ... I can't see a difference)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean - Python "and" operator with ints

What is the explanation for this behavior in Python? a = 10 b = 20 a and b # 20 b and a # 10 a ... to the second value? Because it is second? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean logic - How to make logical OR with AND,and NOT?

How to create a logical OR with logical AND, and logical NOT? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean - Safely converting string to bool in PowerShell

I'm trying to convert an argument of my PowerShell script to a boolean value. This line [System.Convert]:: ... too cool for input validation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean - C++: Set bool value only if not set

I have code in my C++ application that generally does this: bool myFlag = false; while (/*some finite ... memory if the variable is false. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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493 views

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boolean logic - What is the difference between Verilog ! and ~?

So it ended up that the bug that had kept me on for days, was a section of code that should have ... confirm the original behaviour I observed. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean - Convert String to Bool in Swift - via API or most Swift-like approach

Is there an API to convert most possible String representations of Boolean values (e.g. "True", "true", " ... about the language in the process. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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boolean - What's the difference between XOR and NOT-EQUAL-TO?

My question uses Java as an example, but I guess it applies to probably all. Is there any practical ... ended quickly without any result. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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664 views

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boolean - python how to "negate" value : if true return false, if false return true

if myval == 0: nyval=1 if myval == 1: nyval=0 Is there a better way to do a toggle in python, like a nyvalue = not myval ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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574 views

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boolean - What's the difference between XOR and NOT-EQUAL-TO?

My question uses Java as an example, but I guess it applies to probably all. Is there any practical ... ended quickly without any result. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

1 answer

boolean - python how to "negate" value : if true return false, if false return true

if myval == 0: nyval=1 if myval == 1: nyval=0 Is there a better way to do a toggle in python, like a nyvalue = not myval ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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boolean 'and' in Python

Can somebody explain the reasoning behind the following tests ?? >>> 1 and True True >>> {'foo': 'Foo'} and True True >>> {} and True {} >>> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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595 views

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boolean expression - Disjunctive Normal Form in Python

Using python, what is the best way to convert a string of ANDs and ORs into disjunctive normal form (also known as "sum ... AND d) OR (b AND c) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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boolean logic - Whats wrong with my if else statement

I have a $name variable containing a string, and when I test it, I never get the "Name should be between 2 ... between 2 and 40 characters'; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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467 views

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boolean - Why does 1..99,999 == "1".."99,999" in R, but 100,000 != "100,000"?

In the console, go ahead and try > sum(sapply(1:99999, function(x) { x != as.character(x) })) 0 ... certain datasets due to the above problem! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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666 views

1 answer

boolean - Automatic conversion from double/int/string to bool in C++

I'm a Java programmer who has been trying to learn a bit of C++ on the side to expand on my knowledge. Here is a ... : 1 1 1 0 */ TIA, sasuke See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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816 views

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boolean - Why I can't extend bool in Python?

>>> class BOOL(bool): ... print "why?" ... why? Traceback (most recent call last): File "< ... type I thought Python trusted the programmer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

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boolean operations - Why do most programming languages only have binary equality comparison operators?

In natural languages, we would say "some color is a primary color if the color is red, blue, or yellow." In every ... f(x):x < 300, IsPrime) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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510 views

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boolean - 'True' and 'False' in Python

I tried running this piece of code: path = '/bla/bla/bla' if path is True: print "True" else: print " ... value as True. Why is this happening? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

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boolean - What is !0 in C?

I know that in C, for if statements and comparisons FALSE = 0 and anything else equals true. Hence, int j = 40 int k = ... m == ? // what is m? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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498 views

1 answer

boolean - C : is there "lazy evaluation" when using && operator, as in C++?

I would like to know if this looks correct : while((next !=NULL) && (strcmp(next->name, some_string) < ... errors on some compilers with that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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773 views

1 answer

boolean - True/False vs 0/1 in MySQL

Which is faster in a MySQL database? Booleans, or using zero and one to represent boolean values? My frontend just has a yes/no radio button. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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boolean logic - Why are JavaScript negative numbers not always true or false?

-1 == true; // false -1 == false // false -1 ? true : false; // true Can anyone explain the ... to come up with a totally different result. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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boolean - bash "if [ false ];" returns true instead of false -- why?

Why does the following output True? #!/bin/sh if [ false ]; then echo "True" else echo "False" fi This ... works, but I do not understand why. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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613 views

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boolean - What evaluates to True/False in R?

For example, in Ruby, only nil and false are false. What is what in R? e.g.: 5==TRUE and 5==FALSE ... (objects, numbers, etc.) evaluate to? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

1 answer

boolean - Why is a char and a bool the same size in c++?

I'm reading The C++ Programming Language. In it Stroustrup states that sizeof(char) == 1 and 1 <= sizeof(bool ... take the same space as a char? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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640 views

1 answer

boolean - Why 0 is true but false is 1 in the shell?

false; echo $? The above will output 1, which is contradictory with all other programming languages I know. Any reason in this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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479 views

1 answer

boolean - Why does "one" < 2 equal FALSE in R?

I'm reading Hadley Wickham's Advanced R section on coercion, and I can't understand the result of this ... logical vector like these examples? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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