打印N以内的素数

[java]代码库

import java.util.*;
public class Main {
	public static void main(String[] args)
	{
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int flag = 0, i = 2;
		for(; i < N; i++)
		{
			int flag1 = 0;
			for(int j = 2; j <= i/2; j++)
			{
				if(i%j == 0)
				{
					flag1 = 1;
					break;
				}
			}
			if(flag1 == 0)
			{
				if(flag == 0)
				{
					System.out.print(i);
					flag = 1;
				}
				else 
					System.out.print(","+i);
			}
		}
   }
}