Initializing my long array with prime numbers

[Andrea Menjivar]

    Hi, I'm having a hard time figuring out how to initialize my array with prime numbers using the method I created. I keep getting this error: "incompatible types: possible lossy conversion from long to int" for the line
primes[number] = number;
How do I fix this? Here is what I wrote:

public class Prime
{
   public static void main(String[] args)
   {
      long [] primes = new long [46];
      for ( long number = 2; number <= primes.length; number++ )
         {
         if ( isPrime(number) )
            {
              primes[number] = number;
            }
         }
      System.out.println(primes);
         
   }

   public static boolean isPrime (long number)
   {

     for ( long counter = 2; counter*counter <= number; counter++ )
        {
           if ( number % counter == 0 )
              return false;
        }
      return true;
   }
}

[Liutauras Vilda]

Welcome to the Ranch.

You probably know that array indices start counting from zero. Looking to your code, you start filling an array from position 2 (at best), which is the 3rd element in an array - probably it isn't what you want.

You correctly identified that you need a method which defines if number is a prime one. Is that method correct? Have you tested, verified that?

Going back to the loop within the main method, in order to fill in an array fully, you need to iterate over each its element position, that means starting from index 0 each time increasing it by 1, until condition 'index < primes.length' fails.

[Carey Brown]

This is a continuation of this thread https://coderanch.com/t/672713/java/Writing-static-method-calculates-number

[Henry Wong]

Yeah. Let's stay with the original topic.

Henry