C# penultimate of a number

Question

So my question is how can I retrieve the penultimate digit of the number that the user wrote down? Below is my code so far:

Console.Write("Write a numeral: ");
string s = Console.ReadLine();
int a = int.Parse(s);

string s = Console.ReadLine(); – Anton Komyshan Jan 30 '17 at 15:22 — Anton Komyshan, Jan 30 '17 at 15:22

score 1 · Accepted Answer · answered Jan 30 '17 at 16:30

If you mean penultimate digit in the number then

var penultimate = (a / 10) % 10;

should give you the value.

However, it's also highly advisable to check if the number has at least 2 digits

a => 10 || a <= -10

And also handle the possibility that the input is not a number.

1 Answers1