Prime_range.java

/*
  A positive integer greater than 1 which has no other
  factors except 1 and the number itself is called a prime number.
  2, 3, 5, 7 etc. are prime numbers as they do not have any other factors.
*/
import java.util.Scanner;
public class Prime
{
  public Prime(int first_range, int second_range)
  {
    for (int i = first_range; i <= second_range; i++)
    {
      int put = 1;
      for (int j = 2; j < i / 2; j++)
      {
        if (i % j == 0)
        {
          put = 0;
          break;
        }
      }
      if (put == 1)
      {
        System.out.println(i);
      }
    }
  }
public static void main(String[] args)
{
  Scanner scan = new Scanner(System. in );
  System.out.println("Please enter range..");
  int first_range = scan.nextInt();
  int second_range = scan.nextInt();
  Prime out = new Prime(first_range, second_range);
}
}

/*
  Time complexity is O(n)
  Space complexity is O(n)

  Input :
  Please enter range..
  20
  50

  Output:
  23
  29
  31
  37
  41
  43
  47
  */