How to fine prime number in C++ using easy code?

Question

I wanna learn to find prime number using c++

Answer 1

https://code.sololearn.com/c86d0r4Rqzoe/?ref=app

Answer 2

//Lengthy? As in code length or time?? In coding, you need to sacrifice readability for shorter length. So if you want shorter it will be less readable.
//Ps. You can use recursion for "shorter length"

bool isprime(int n,int i){
if(n%i==0){
if(i==1) return true;
else return false;
}
else return isprime(n,i-1);
}

Where i=sqrt(n)

Answer 3

its lengthy code