How to check is a number is on left side or right side of number

Question

How to check is a number is on left side or right side of number

for example number is 2 and i want where it is on 12 and 23

which is 2 is left side on 23 and right side on 12

my code

class Solution
{
   public static  void Main(String[] args)
   { 
      var number =  12;
      foreach(char c in number.ToString()){
         if(c=='2'){
            Console.WriteLine(c);
         }
      }
   }
}

Answer 1

Check this code out:

CheckNumber(12);
CheckNumber(23);

static void CheckNumber(int number)
{
    var str = number.ToString();
    if (str[0] == '2')
        Console.WriteLine("2 is in left");
    if (str[^1] == '2')
        Console.WriteLine("2 is in right");
}