Find the largest Pair in an integer

Question

I'm playing around with numbers, and I'm looking to write a small program that will return the largest double-digit of an integer that's passed in for example:

I pass in 2215487 it should return 87

I pass in 98765499 It should return 99

I've tried looking at Math.Max, but I don't believe that's what I'm looking for unless I have overlooked it

Answer 1

A very simple solution would be as follows:

    var thenumber = 987654990;
    var s = thenumber.ToString();
    var max = 0;
    for (var i = 0; i < s.Length-1; i++) {
        int d1 = (int)(s[i] - '0');
        int d2 = (int)(s[i+1] - '0');
        max = Math.Max(max, 10*d1+ d2);
    }
    Console.WriteLine(max);

Ie, just iterate over the number and calculate the "pair" at the current position (consisting of the current digit d1 and the next one d2) if the pair is greater than the current max, make it the new max ...