JAVA——孪生素数

package 孪生素数;

public class 孪生素数 {
    public static void main(String[] args)
    {
        int i,j;
        int flag, n = 0;
        int a[] = new int[100];
        
        for(i = 2; i <= 100; i++)
        {
            flag = 1;
            
            for(j = 2; j < i; j++)
            {
                if(i%j == 0)
                {
                    flag = 0;
                    break;
                }
            }
            
            if(flag == 1)
            {
                a[n] = i;
                n++;
            }
            
        }
        
        System.out.println("100以内的孪生素数如下：");
        
        for(i = 0; i < n-1; i++)
        {
            if(a[i+1]-a[i] == 2)
            {
                System.out.print(a[i]+" ");
                System.out.print(a[i+1]+" ");
                System.out.println("\n");
            }
        }
    }
}