StackOverflow?

Hello everyone.I have just joined the forum.
Kindly help me with the source code to find the largest prime factor of a 12-digit number.

HTML:

import java.io.*;
import java.util.Scanner;
class primefactor
{
    public static void main(String args[])
    {
        try{
        long num,i,j,count=0L,rem;
        long ans=0L;
        System.out.println("Enter the number whose greatest prime factor is required:");
        Scanner sc=new Scanner(System.in);
        num=sc.nextLong();
        for(i=1;i<=num;i++)
        {
        
            for(j=1;j<=i;j++)
            {
                if(i%j==0)
                    count=count+1;
                
            }
            if(count==2)
            {
                rem=num%i;
                if(rem==0)
                    ans=i;
                    
                
            }
            count=0;
        }
        System.out.println("The answer is "+ ans);}
        catch(Exception e){System.out.println(e.getMessage());}
    }
}

Thank You

 

How does StackOverflow relates here and please explain the process you have folowed so far

 

I didn't follow any process.I am not even sure that this is a stack overflow error.

 

What do you mean? StackOverflow erro is thrown when a stack overflow occurs because an application recurses too deeply.