Recent questions tagged Boolean

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boolean - Why do 'and' & 'or' return operands in Python?

I'm going through the LPTHW and I came across something I cannot understand. When will it ever be the case that you ... ). Play with this a bit. See Question&Answers more detail:os...

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

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511 views

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boolean - Python evaluates 0 as False

In the Python console: >>> a = 0 >>> if a: ... print "L" ... >>> a = 1 >>> if a: ... print "L" . ... : ... print "L" ... L Why does this happen? See Question&Answers more detail:os...

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

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648 views

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boolean - C++ : why bool is 8 bits long?

In C++, I'm wondering why the bool type is 8 bits long (on my system), where only one bit is enough to ... Or is it just one of these 'historical' reasons ? Question&Answers:os...

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

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736 views

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boolean - Python's in (__contains__) operator returns a bool whose value is neither True nor False

As expected, 1 is not contained by the empty tuple >>> 1 in () False but the False value returned is not equal ... Python 3. Can you explain what is going on? Question&Answers:os...

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

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boolean - c++ bool question

This question already has answers here: Question&Answers:os...

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

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398 views

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boolean operations - De Morgan's rules explained

Could you please explain the De Morgan's rules as simply as possible (e.g. to someone with only a secondary school mathematics background)? Question&Answers:os...

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

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634 views

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boolean - Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?

Simple question really; is there a difference between these values (and is there a difference between BOOL and bool)? ... as 0. Is there really any difference? Question&Answers:os...

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

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459 views

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boolean - Is it Pythonic to use bools as ints?

False is equivalent to 0 and True is equivalent 1 so it's possible to do something like this: def bool_to_str( ... kind of use Pythonic or should it be avoided? Question&Answers:os...

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

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759 views

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boolean - Is sizeof(bool) defined in the C++ language standard?

I can't find an answer in the standard documentation. Does the C++ language standard require sizeof(bool) to ... byte), or is this size implementation-defined? Question&Answers:os...

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

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659 views

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boolean - PHP - Get bool to echo false when false

The following code doesn't print out anything: $bool_val = (bool)false; echo $bool_val; But the following code ... is false than adding an if statement? Question&Answers:os...

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

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747 views

1 answer

boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself?

The following shows that "0" is false in Javascript: >>> "0" == false true >>> false == "0" true So why does the ... ha"? >>> if ("0") console.log("ha") ha Question&Answers:os...

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

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536 views

1 answer

boolean - Double Negation in C++

I just came onto a project with a pretty huge code base. I'm mostly dealing with C++ and a lot of the ... value. Is this correct, or am I missing something? Question&Answers:os...

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

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535 views

1 answer

boolean logic - Does Python support short-circuiting?

Does Python support short-circuiting in boolean expressions? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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451 views

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boolean - How to proof (x+y)(x’+z)(y+z) = (x+y)(x’+z)

I made OR in the end, but I cannot solve that. I just got the final answer xy+xz+yz without a x, if I ... :https://stackoverflow.com/questions/65858470/how-to-proof-xyx-zyz-xyx-z...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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499 views

1 answer

boolean logic - Why does (not false and true or not false and not true) come out to True?

Why does (not false and true or not false and not true) come out to True? If we evaluate in order, from left to right ... -false-and-true-or-not-false-and-not-true-come-out-to-true...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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454 views

1 answer

boolean - C++, set bool to false, return old

This code: bool b = isTrue; isTrue = false; saves old isTrue value to b, then sets isTrue to false. All ... ://stackoverflow.com/questions/65946859/c-set-bool-to-false-return-old...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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618 views

1 answer

boolean - Using True False with Ansible When Clause

I'm running into the silliest issue. I cannot figure out how to test for boolean in an Ansible 2. ... stackoverflow.com/questions/39640654/using-true-false-with-ansible-when-clause...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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605 views

1 answer

boolean - C++ safe bool wrapper

I'm trying to design a bool wrapper struct applying the safe bool idiom. The classic implementation to solve ... :https://stackoverflow.com/questions/41684654/c-safe-bool-wrapper...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

464 views

1 answer

boolean variable values in PHP to javascript implementation

(This question already has answers here): question from:https://stackoverflow.com/questions/5517748/boolean-variable-values-in-php-to-javascript-implementation...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

1 answer

boolean variable values in PHP to javascript implementation

(This question already has answers here): question from:https://stackoverflow.com/questions/5517748/boolean-variable-values-in-php-to-javascript-implementation...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

1 answer

boolean - Is Java 8 missing an OptionalBoolean?

As a primitive version of Optional*, Java 1.8 provides OptionalInt, OptionalLong and OptionalDouble. But I cannot ... .com/questions/23922134/is-java-8-missing-an-optionalboolean...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

383 views

1 answer

boolean - Is Java 8 missing an OptionalBoolean?

As a primitive version of Optional*, Java 1.8 provides OptionalInt, OptionalLong and OptionalDouble. But I cannot ... .com/questions/23922134/is-java-8-missing-an-optionalboolean...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

504 views

1 answer

boolean - Is there any legitimate use of list[True], list[False] in Python?

Since True and False are instances of int, the following is valid in Python: >>> l = [0, 1, 2] > ... /questions/38117555/is-there-any-legitimate-use-of-listtrue-listfalse-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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450 views

1 answer

boolean - Is there any legitimate use of list[True], list[False] in Python?

Since True and False are instances of int, the following is valid in Python: >>> l = [0, 1, 2] > ... /questions/38117555/is-there-any-legitimate-use-of-listtrue-listfalse-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

477 views

1 answer

boolean - Is there any legitimate use of list[True], list[False] in Python?

Since True and False are instances of int, the following is valid in Python: >>> l = [0, 1, 2] > ... /questions/38117555/is-there-any-legitimate-use-of-listtrue-listfalse-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

605 views

1 answer

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 ... :https://stackoverflow.com/questions/5681166/what-evaluates-to-true-false-in-r...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

538 views

1 answer

boolean - How to set python variables to true or false?

I want to set a variable in Python to true or false. But the words true and false are interpreted as undefined ... /questions/12644075/how-to-set-python-variables-to-true-or-false...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

512 views

1 answer

boolean - Why is 'True == not False' a syntax error in Python?

Comparing boolean values with == works in Python. But when I apply the boolean not operator, the result is a syntax ... /6100305/why-is-true-not-false-a-syntax-error-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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