Question

The variable x takes the values ​​from 1 to 100, with these values, create two lists, one where the prime numbers are stored in one, and another where the non-prime numbers are stored, indicate and print the result

Answer 1

Code:

import java.util.*;  
class Main{  
    public static boolean CheckPrime(int n) {     
        for (int i = 2; i <= n / 2; i++) {    
            if ((n % i) == 0) {       //ckeck number is divisible by any previous numbers 
                return false;         //if divisible then ite not prime then return false
            }
        }
        return true;     //if number is not divisible by any previous numbers then its prime number so return true
    }
    public static void main(String args[]){ 
        
        int[] x = new int[100];                  //initialize x variable to store 1 to 100 numbers
        boolean isPrime;
        
        ArrayList<Integer> prime=new ArrayList<Integer>();   //list to store prime numbers
        ArrayList<Integer> nonprime=new ArrayList<Integer>(); //list to store non prime numbers
        for (int i = 0; i < 100; i++) {       //store 1 to 100 numbers in x variable
            x[i]=i+1;
        }
        for (int i = 0; i < 100; i++) {       //Iterate 1 to 100 numbers
            isPrime = CheckPrime(x[i]);       //call function to check number is prime or not
            if (isPrime)                      //if number is prime number
                prime.add(x[i]);              //then store in prime list
            else
                nonprime.add(x[i]);          //otherwise store in nonprime list
        }
        System.out.println("Prime numbers between 1 to 100:\n"+prime);        //print list of prime numbes
        System.out.println("\nNon-Prime numbers between 1 to 100:\n"+nonprime); //print list of nonprime numbers
    }  
}

Output:

.