help me understand this code please

Question

Write a function that accepts a positive integer n argument and returns a value of 1 if n belongs to the set H ={2^x⋅3^y⋅5^z | x, y, z∈N} respectively 0 otherwise.

int function(int n) {

for(auto& it : {2, 3, 5})
while(n % it == 0)
n /= it;

return (n == 1);
}

Answer 1

Make you understand it? Sorry i run out of spells!… ~_~

Answer 2

auto is defining the type of the variable automatically, by looking at the value assigned to the variable ( a bit like 'var" in c#, maybe?)

Answer 3

@Catalin btw, out of curiosity, can you confirm what the set H is in the initial question? ( in english, or with an example😆)

Answer 4

I think the best I can do is giving an example
function(180)=1 as 180=2^2•3^2•5^1
function(385)=0 as 385=5^1•77^1
I don't understand what you're trying to say by "in the initial question", but the set H( I hope the word "set" is used correctly as I don't know a substitute for it) is surely an important part of the problem.

Answer 5

@Catalin Ok that makes sense. Thanks!

Answer 6

well I don't even know what auto& it:{2,3,5} is, that's the main problem

Answer 7

Tristan, thank you for that, but I already know the math, I don't need you to explain it, I even made a program that properly solves the problem, but the code in the description is an alternative solution witch I don't understand how it works...

Answer 8

'auto & it : {2,3,5}' means "for each value in {2,3,5}"

Answer 9

thanks @ifl, could you give me a few more details about how that works? like what "auto" and "&" are?

Answer 10

thanks @ifl ,you really helped me :)