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题目：给你一个整数 n，请你帮忙计算并返回该整数「各位数字之积」与「各位数字之和」的差。
这是最终代码：
import java.util.Scanner; public class One { public static void main(String[]
args) { Scanner sc=new Scanner(System.in); System.out.println("请输入n的值"); int
a=sc.nextInt(); System.out.println(getAdd(a)); } public static int getAdd(int
n) { int muti=1; int add=0; while(n!=0) { muti*=n%10; add+=n%10; n=n/10; }
return (muti-add); } }
用while循环，对10取余，得到每一位数字再去依次和muti,add相乘和相加。
而我的初步思路是这样：定义方法，它不是每一位的相加或者相乘，就先把每位数字算出来，再这些数字分别相加乘，减，然后调用。
所以就有了我这种啰嗦的做法而且还不对。
复杂性如下：
问题
（1）因为不能确定他就只会执行ge下面的不执行，
（2）一开始就把位数定了；
这里名词解释一下：
public：权限修饰符，就是公开，所有方法都可调用；
static：静态修饰符；
getAdd:方法名；
形参：方法定义时的参数，只是个形式，任意取；
实参：调方法的后面跟的参数，比如(getAdd(a)这个a 就是实参；
实参的值赋给形参让他去执行自己的功能块。
