public class app4_10
{
    public static void main(String args[])
    {
        final int MAX=100;
        int j,k,n;
        System.out.println("2~"+MAX+"之间所有的素数为:");
        System.out.print("2\t");
        n=1;
        k=3;
        do
        {
            j=3;
            while(j<Math.sqrt(k)&&(k%j!=0));
            j++;
            if(j>Math.sqrt(k))
            {
                System.out.print(k+"\t");
                n++;
                if(n%10==0)  System.out.println();
            }
            k=k+2;
        }while(k<MAX);
        System.out.println("\n共有【"+n+"】个素数");
    }
}



结果 是：2 3 5 7  9
结果是：2 3 5 7 11 13 17 19 23 29
        31 37 41 43 47 53 59 61 67 71
        73 79 83 89 87
共有 【25】个素数
用的是JCreator Pro 编译器   谢谢大家帮忙解答