How To Get Largest Number from numbers without using of list or array?

string s = "1234"; int temp = 0; for (int i = 0; i <= s.Length - 1; i++) { for (int j = 0; j <= s.Length - 1; j++) { if (s[i] > s[j]) { temp = s[i]; } } } Console.Write(Convert.ToChar(temp));

you can use substring and loop to find number

Where to store the number without using any collection like list or array or dictionary or hashtable and ect..?

string a = "517378"; int max = 0; while (a.ToString().Length > 1) { max = Convert.ToInt32(a.Substring(0, 1)); a = a.Substring(1, a.ToString().Length - 1); if (max > Convert.ToInt32(a.Substring(0, 1))) { a = a.Remove(0, 1).Insert(0, max.ToString()); } } MessageBox.Show("Second Max Num is : "+max.ToString());