有没有更好的方法来找到数字乘法和求和？

Question

int N = 2345;
        var digitArray = N.ToString().ToCharArray();
        int multiplicationSum = 1;
        foreach (char digit in digitArray)
        {
            multiplicationSum = int.Parse(digit.ToString()) * multiplicationSum;
        }
        var sum = 0;
        var sumArray = multiplicationSum.ToString().ToCharArray();
        foreach (char digit in sumArray)
        {
            sum = int.Parse(digit.ToString()) + sum;
        }

谢谢

Answer 1

假设你不需要处理负数,那么在数学上做这样做会更有意义

int N = 2345;
int multiplicationSum = 1;
while(N!=0)
{
  multiplicationSum = multiplicationSum * (N%10);
  N = N/10;
}
var sum = 0;
while(multiplicationSum!=0)
{
  sum = sum + (multiplicationSum%10);
  multiplicationSum = multiplicationSum/10;
}

参考文献:

%运算符

%运算符在将第一个操作数除以第二个操作数后计算余数

/运营商:

除以两个整数后,结果始终为整数.例如,7/3的结果是2