Shortest code challenge

Question

What could be the shortest code to find whether a given number is prime or not?

Answer 1

Perhaps it could be even shorter ;)
https://code.sololearn.com/c2N2QeHwmnVv/?ref=app

Answer 2

This is a Python solution, which does not accept 1 as prime. And it's the shortest code posted yet.
https://code.sololearn.com/cM6zTF9r4aeK/?ref=app

Answer 3

https://code.sololearn.com/c3ECgQg6B8kg/?ref=app

Answer 4

Here's, shortest in Java:
https://code.sololearn.com/cJqN2oluFpuv/?ref=app

Answer 5

using c language :
https://code.sololearn.com/c9KgZS7LhEK4/?ref=app

Answer 6

My try with C++:

https://code.sololearn.com/c5RrtIP59y1p/?ref=app

Answer 7

https://code.sololearn.com/W5jgG6c8e4uh/?ref=app

Answer 8

@Utkarsh Actually, 1 is not a prime, so.. ;)

Answer 9

@Utkarsh If I understand it correctly, if you have a given is_prime() function, you can give it any argument, let's say:

is_prime(int(input())) # checks a user-input number
is_prime(int(math.sqrt(625)) # checks the result
etc.

Answer 10

https://code.sololearn.com/cdVKf98EKe9Q/?ref=app

Answer 11

@ Kuba
https://code.sololearn.com/c2N2QeHwmnVv/?ref=app

Great logic

But if we give 1 as input it displays True, which is wrong.
How can we avoid providing non positive or 1 as the input to the function and still use it to serve our purpose, again in a shortest way

Answer 12

Prime number checker !!
https://code.sololearn.com/c5Q1ExJ10i1x/?ref=app

Answer 13

https://code.sololearn.com/crB6bP3WP7gq/?ref=app

Answer 14

thanks everyone for your posts👍
@kuba siekierzynski
@the coding sloth
@groompel
@chloe

i still have this doubt.

we all can understand which numbers are prime or composite or neither prime nor composite.

but this won't be the case if the function is taking input from output of other function or from the results of some code.
Then what could be a possible solution for it?

Answer 15

@Pegasus
@Mizo PRO
@Barichnel D Sonna
@Kartik Krishnan

thanks everyone for your code

Answer 16

Ruby, anyone?:

> require "prime"
> Prime.prime?(23) # It returns true.

Code example:
https://code.sololearn.com/c1KJ790a4q6J/#rb

Answer 17

Ruby is the shortest

Answer 18

https://code.sololearn.com/cD4Cg2DhGQ0n/?ref=app

I accept all downvotes... dont hesitate to do so.
But sooner or later programming will highly mean using web apis.

Answer 19

@Pegasus Cool
Oh and you can make your code even shorter if you replace 'puts' with 'p'.

Answer 20

This is just

all(n % i for i in range(2, n))

dressed up

https://code.sololearn.com/cLhIXYL9mkHG/?ref=app

(short but not fast)