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);
}
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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);
}
bool isEven(int num) {
return num == 0 || !isEven(num - (num > 0 ? 1 : -1));
}
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
I shit you not but one coworker I had dared call himself a data scientist and did something really similar to this but in Python and in production code. He should never have been hired. Coding in python was a requirement. I spent a good year sorting out through his spaghetti code and eventually rebuilt everything he had been working on because it was so bad that it only worked on his computer and he always pip freezes all requirements, and since he never used a virtual environment that meant we got a list of ALL packages he had installed on pip for a project. Out of those 100, only about 20 were relevant to the project.
In prod??
Listen up folks. This is why we do code reviews. This right here.
Code reviews mean fuck all when the "senior" developer doing the review is someone who implements an entire API endpoint group in one single thousand-something lines magic function that is impossible to decipher for mere humans.
Just print True all the time. Half the time it will be correct and the client will be happy, and the other half the time, they will open a ticket that will be marked as duplicate and closed.
Reminds me of the fake thermometers being sold during the peak of COVID that weren't actually thermometers but just displayed numbers to make people think they were.
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.
Don't forget that you can have fall-through cases, so you can simplify it even further:
switch (number) {
case 1:
case 3:
case 5:
case 7:
case 9:
...
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)]
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
amateurs
def is_even(n: int):
if n ==0:
return True
elif n < 0:
return is_even(-n)
else:
return not is_even(n-1)
here's a constant time solution:
def is_even(n: int):
import math
return sum(math.floor(abs(math.cos(math.pi/2 * n/i))) for i in range(1, 2 ** 63)) > 0
spoiler
i can't imagine how long it'll take to run, my computer took over 3 minutes to compute one value when the upper bound was replaced with 2^30^. but hey, at least it's O(1).
You have to make it easy on yourself and just use a switch with default true for evens, then handle 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.
How do you think even/odd detectors work? A team of coders has been working on this else if for years...
If you want to help
Just in case anyone was looking for a decent way to do it...
if (((number/2) - round(number/2)) == 0) return true;
return false;
Or whatever the rounding function is in your language of choice.
EDIT: removed unnecessary else.
Modulo operator my dude.
Every bit aside for the ones bit is even. All you have to do is get the ones bit(the far right) for it being a 1 or 0. Which is the fastest and least amount of code needed.
use bitwise &
// n&1 is true, then odd, or !n&1 is true for even
return (!(n & 1));
Just do npm install isEven
and don't worry about it.
looks like it depends on isOdd, which is unmaintained. I have a dependency conflict, what should I do?
Still some of YandereDev's best code
Good job my young padawan, let me teach you about the modulo operator ...
There is absolutely no need to add a check for each individual number, just do this:
#include
#include
int main()
{
int number = 0;
int numberToAdd = 1;
int modifier = 1;
std::cout << "Is your number [p]ositive or [n]egative? (Default: positive)\n";
if (std::cin.get() == 'n') {
modifier *= -1;
}
std::cin.ignore(std::numeric_limits::max(), '\n'); // Clear the input buffer
bool isEven = true;
bool running = true;
while (running) {
std::cout << number << " is " << (isEven ? "even" : "odd") << ".\n";
std::cout << "Continue? [y/n] (Default: yes)\n";
if (std::cin.peek() == 'n') {
running = false;
}
number += numberToAdd * modifier;
isEven = !isEven;
std::cin.ignore(std::numeric_limits::max(), '\n');
}
std::cout << "Your number, " << number << " was " << (isEven ? "even" : "odd") << ".\n";
}```
Just do a recursive funcion subtracting 2 and stoping on -1 or 0. Easy
OMG they can’t even!
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
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
Even the shitposty better version has us:
int is_even(int n)
{
int result = -1;
char number[8]; //should be enough
sprintf(number, "%d", n);
// check the number
// TODO: handle negative numbers
for (char *p=number; *p; p++)
{
if (*p=='0' || *p=='2' || *p=='4' || *p=='6' || *p=='8')
result = 1;
else if (*p=='1' || *p=='3' || *p=='5' || *p=='7' || *p=='9')
result = 0;
else {
fprintf(stderr, "Your number is wrong!\n");
exit(1);
}
}
return result;
}
no way this is real
From what I've heard about yanderedev... it's possible this is actually real.
Now make it a switch case