我想从我的生日中找到一个幸运数字,例如:1985年6月7日。我的生日幸运数字1 + 9 + 8 + 5 + 6 + 7 = 36 >> 3 + 6 =9。我的幸运数字是9.我尝试编码。我在编码时使用了4次。我想缩短它,我想获取任何长度数字的数字总和。怎么编码?
c#
private void btn_lucky_Click(object sender, EventArgs e)
{
string Bday = dateTimePicker1.Text.Replace("-", "");
int Bnumber = int.Parse(Bday);
int a1 = Bnumber, sum1 = 0, b1;
while (a1 != 0)
{
b1 = a1 % 10;
sum1 = sum1 + b1;
a1 = a1 / 10;
}
txt_lucky.Text = sum1.ToString();
if (sum1 < 10)
{
txt_lucky.Text = sum1.ToString();
}
int a2 = sum1, sum2 = 0, b2;
if (sum1 > 9)
{
while (a2 != 0)
{
b2 = a2 % 10;
sum2 = sum2 + b2;
a2 = a2 / 10;
}
txt_lucky.Text = sum2.ToString();
}
int a3 = sum2, sum3 = 0, b3;
if (sum2 > 9)
{
while (a3 != 0)
{
b3 = a3 % 10;
sum3 = sum3 + b3;
a3 = a3 / 10;
}
txt_lucky.Text = sum3.ToString();
}
}
答案 0 :(得分:4)
这是递归的最佳选择,如果您使一个函数返回与输入相同类型的输出,则可以这样做。它会重复自己,直到以一位数字结尾。
public static string LuckyNumber(string date) // "06/07/1985"
{
var result = (date ?? "") // in case date is null
.ToCharArray() // ['0','6','/','0','7','/','1','9','8','5']
.Where(char.IsNumber) // ['0','6','0','7','1','9','8','5']
.Select(char.GetNumericValue) // [0,6,0,7,1,9,8,5]
.Sum() // 36
.ToString(); // "36"
if (result.Length == 1) return result; //"36" is not 1 digit, so...
return LuckyNumber(result); //repeat the above with "36"
}
实施:
string date = "06/07/1985";
var luckyNumber = LuckyNumber(date);
System.Console.WriteLine(luckyNumber);