代码片段

Excel 列编号

static string NumbertoString(int n)        {            string s = "";     // result               int r = 0;         // remainder               while (n != 0)            {                r = n % 26;                char ch = r == 0 ? 'Z' : (char)(r - 1 + 'A');                s = ch.ToString() + s;                n = s[0] == 'Z' ? n / 26 - 1 : n / 26;            }            return s;        }

交换两个数

            a = a ^ b;            b = a ^ b;            a = a ^ b;