The expression is not parsed the way you think. It’s not (test1=false) || (test1 == false) in which case the result would have been true, but test1 = (false || test1 == false) The value of false || test1 == false expression is computed first, and it is false, because test1 is set to true … Read more
If key isn’t an int or float but a string, you need to convert it to an int first by doing key = int(key) or to a float by doing key = float(key) Otherwise, what you have in your question should work, but if (key < 1) or (key > 34): or if not (1 … Read more
PHP’s comparison operators deviate from the computer-scientific definitions in several ways: In order to constitute an equivalence relation == has to be reflexive, symmetric and transitive: PHP’s == operator is not reflexive, i.e. $a == $a is not always true: var_dump(NAN == NAN); // bool(false) Note: The fact that any comparison involving NAN is always … Read more
Here’s a solution in Python based on constraint-programming: from constraint import AllDifferentConstraint, InSetConstraint, Problem # variables colors = “blue red green white yellow”.split() nationalities = “Norwegian German Dane Swede English”.split() pets = “birds dog cats horse zebra”.split() drinks = “tea coffee milk beer water”.split() cigarettes = “Blend, Prince, Blue Master, Dunhill, Pall Mall”.split(“, “) # … Read more
Yes, as the other answers pointed out, the set of operators comprising of || and ! is functionally complete. Here’s a constructive proof of that, showing how to use them to express all sixteen possible logical connectives between the boolean variables A and B: True: A || !A A NAND B: !A || !B B … Read more
I developed a 2048 AI using expectimax optimization, instead of the minimax search used by @ovolve’s algorithm. The AI simply performs maximization over all possible moves, followed by expectation over all possible tile spawns (weighted by the probability of the tiles, i.e. 10% for a 4 and 90% for a 2). As far as I’m … Read more