水仙花数

    public static void printNarcissisticNumber() {
        for (int i = 100; i <= 999; i++) {
            int ones = i % 10;
            int tens  = (i % 100) / 10;
            int hundreds  = i / 100;
            if (i == ones * ones * ones + tens  * tens  * tens  + hundreds  * hundreds  * hundreds ) {
                System.out.println(i);
            }
        }
    }

求余运算符的运算规则

a%b=a-(a/b)b  5%3=5-(5/3)3=2 
5%-3=5-(5/-3)-3=2  -5%3=-5-(-5/3)3=-2 
-5%-3=-5-(-5/-3)-3=-2  如果操作数中有浮点数则采用的规则为  a%b=a-(bq),这里q=int(a/b) 
5.2%3.1=5.2-13.1=2.1  5.2%-3.1=5.2-(-1)(-3.1)=2.1 
-5.2%3.1=-5.1-(-1)3.1=-2.1  -5.2%-3.1=-5.1-(-1)(-3.1)=-2.1