Top "Boolean-expression" questions

Why does `a == b or c or d` always evaluate to True?

I am writing a security system that denies access to unauthorized users. import sys print("Hello. Please enter your name:") …

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Merge lists that share common elements

My input is a list of lists. Some of them share common elements, eg. L = [['a','b','c'],['b','d',…

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boolean variable values in PHP to javascript implementation

I've run into an odd issue in a PHP script that I'm writing-- I'm sure there's an easy answer but …

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Boolean expression order of evaluation in Java?

Suppose I have the following expression String myString = getStringFromSomeExternalSource(); if (myString != null && myString.trim().length() != 0) { ... } Eclipse warns me …

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Detecting XOR in Karnaugh Maps

I got the following Karnaugh Maps but I am still having problems working out the expression for XOR from each …

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Python boolean expression and or

In python if you write something like foo==bar and spam or eggs python appears to return spam if the …

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Convert function with only AND Boolean operations

I have some function like (A and ( B or c)) or (D and E and (F or H or R …

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Is there any reason for "Boolean.TRUE.equals(x)" in Java?

I've come across this code in one of the projects I'm working on (This is in Java) if (Boolean.TRUE.…

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what is the correct way to check for False?

Which is better? (and why?) if somevalue == False: or if somevalue is False: Does your answer change if somevalue is …

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XOR of three values

What is the simplest way to do a three-way exclusive OR? In other words, I have three values, and I …

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