Print contents of array with even spacing

Question

I have a program that takes user input and prints that many palindromic primes (10 per line only and should be evenly spaced). I was printing the values directly and it was working fine, but the numbers are not evenly spaced. So I decided to store them into an array in hopes that they would print out evenly spaced. But now no values are printing. Can someone please point out where I made a mistake? Here is part of the code:

public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.print("Print how many values? ");
        int input = scan.nextInt();
        int[] palPrimes = new int[input];
        int count = 1, val = 2;

        while(count <= input)
        {
            if(isPrime(val) && isPalindrome(val))
            {
                palPrimes[count-1] = val;
            }
            val++;
        }

        for(int i = 0; i < palPrimes.length; i++)
        {
            if(i % 10 == 0)
                System.out.println();
            System.out.print(palPrimes[i] + " ");
        }
    }

Answer 1

You need to increment count when you add a val or your loop never terminates.

if (isPrime(val) && isPalindrome(val)) 
{
    palPrimes[count - 1] = val;
}
val++;

Should be something like

if (isPrime(val) && isPalindrome(val)) 
{
    palPrimes[count - 1] = val;
    count++;
}
val++;

Finally, for even spacing of the numbers, I suggest you use formatting. Something like,

for (int i = 0; i < palPrimes.length; i++) {
    if (i % 10 == 0)
        System.out.println();
    System.out.printf("% 5d", palPrimes[i]);
}

Or, as pointed out in the comments by @m3ssym4rv1n, a tab or two

System.out.print(palPrimes[i] + "\t");

The first option (printf) will align right; the later (\t) aligns left.