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

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

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());

Verify whether each number is higher than the greatest number that exists at the moment. Update the biggest number if that's the case papa's pizzeria. Until every number has been entered, keep doing this. Show the biggest number once all the numbers have been processed.