在C＃中的数字之间放置空格

Question

如何编写一个程序，输入一个由用户五位数组成的数字，将数字分成各自的数字，并将每个数字相互分开的数字打印出来。例如，如果用户键入数字42339，则应打印程序

4 2 3 3 9

Answer 1

string num = "42339";
string result = String.Join("   ", num.Select(c=>c));

修改 这部分只是为了好玩，我从评论中收集了一些备选方案，还添加了一些

string numstr = "42339";

string result = String.Join("   ", numstr.Select(c => c));
string result = String.Join("   ", (IEnumerable<char>) numstr);
string result = String.Join("   ", numstr.AsEnumerable());
string result = String.Join("   ", numstr.ToArray());
string result = String.Join("   ", numstr.ToCharArray());

string result = String.Join("   ", numstr.Where((_) => true));
string result = String.Join("   ", numstr.Where(char.IsDigit));
string result = String.Join("   ", numstr.Select(char.ToLower));

string result = string.Join("   ", Regex.Split(numstr, "")).Trim();
string result = numstr.Aggregate("", (s, c) => s += c + "   ").Trim();

string result = Regex.Replace(numstr, ".", m => m.Value + "   ").Trim();
string result = Regex.Replace(numstr, ".", "$0   ").Trim();
string result = Regex.Replace(numstr, "[^.]{0}", "   ").Trim();

Answer 2

int number = 42339;
var str = string.Join("   ", (IEnumerable<char>)number.ToString());

Answer 3

int number = 42339;
string result = String.Join("   ", number.ToString().ToCharArray());