They call me a StackOverflow expert:
private bool isEven(int num) { if (num == 0) return true; if (num == 1) return false; if (num ＜ 0) return isEven(-1 * num); return isEven(num - 2); }StackoverflowException.
What do I do now?
Nvm. Got it.
if(num % 2 == 0){ int num1 = num/2 int num2 = num/2 return isEven(num1) && isEven(num2) } if(num % 3 == 0){ int num1 = num/3 int num2 = num/3 int num3 = num/3 return isEven(num1) && isEven(num2) && isEven(num3) }Obviously we need to check each part of the division to make sure if they are even or not. /s
…a recursive is-even
wow
Wow. Amateur hour over here. There’s a much easier way to write this.
A case select:
select(number){ case 1: return false; case 2: return true; }And so on.
Just do a while loop and subtract 2 if it’s positive or plus 2 is it’s negative until it reaches 1 or 0 and that’s how you know, easy! /s
God, it’s so obvious, you can do it in only two lines of code.
if (number == 1 || number == 3 || number == 5 || number == 7 || number == 9...) return false; else return true;
This is your brain on python:
def is_even (num): return num in [x*2 for x in range(sys.maxsize / 2)]That won’t work tho, you need to make it sys.maxsize//2 to coerce the output into int form
The number of comments posting a better solution is funny and somewhat concerning.
Yeah, “just use modulo” - no shit, you must be some kind of master programmer
You have to make it easy on yourself and just use a switch with default true for evens, then gandle all the odd numbers in individual cases. There, cut your workload in half.
while (true){ if (number == 0) return true; if (number == 1) return false; number -= 2 }Because YandereDev is a legendary moron I can’t even tell if this is a joke or not.
Oh man, in js we have a package for this magic.
I always forget if is even requires is odd or the other way around.
Weekly Downloads: 293.319
Look at the downloads though!
Good job my young padawan, let me teach you about the modulo operator …
Actually the modulo operator is the wrong solution.
No its not the wrong solution! Premature optimization is a waste of time.
Using if or case are not a solution because they are way too verbose and very easy to introduce an error.
Modulo is a solution, and using bit-wise and is another faster solution.
You call it premature optimization. I call it obvious.
You use a flat head as a Phillip’s.
I call it making assumptions that may be incorrect, and do you know if the compiler will do the optimization anyway in this case?
What statement do you flag as assumption? Yes, I do. The modulo operator is only a subset of bit masks. It is more explicit to write:
if ( (variable &EVEN_MASK) == 0) …
To act upon even numbers then:
if ( (variable %2) == 0) …
How would you name the 2 in the above statement for more expressive power?
EVEN_MODULO_OP ? That may throw more people off imo.
You shouldn’t rename 2 at all. “Even” has a commonly understood meaning that is instantly recognizable from
(variable %2) == 0. The bitmask is an overgeneralization.I give up, I was wrong to even think about the modulo operator, you are clearly the master programmer. 🥇
This reminds me of a discussion about the ternary operator
? :, some people think its the one true way of writing code because its just so clear what it does. And I say please use it sparingly because if you start doing nested ternary operators its very hard to unpack what your code does, and I prefer readability over compact code, especially with today’s compilers.
OMG they can’t even!
number == 0is not handledYou can’t see it but there’s an “else return true;” at the bottom
string taco = variable.ToString()[variable.ToString().Length - 1];
If (taco == “0” || taco == “2” || taco == “4” || taco == “6” || taco == “8”)
return true;
else
return false;
Im something of a coding master myself
as division is complicated and expensive depending on the size of the numbers you’d usually receive as an input, this could be the most efficient solution. Certainly could have the best worst case if we imagine some 128bit shenanigans.
Ok looks like this might be the source, and I suspect it is actually satirical. Not yanderedev, but yeah… wouldn’t put it past him.
https://www.reddit.com/r/ProgrammerHumor/comments/i15h4d/iseven/
We’re too swamped for that kind of thinking. Just keep typing or we’ll never make our release window
