c# - 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

假设您不需要处理负数，似乎在数学上这样做会更有意义

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：

％ 操作员

% 运算符计算第一个操作数除以第二个操作数后的余数

/ 运算符：

当您将两个整数相除时，结果始终是整数。例如，7 / 3 的结果是 2