Find the largest Pair in an integer

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

>Solution :

You can divide by 10 each time and then compare the remainder of dividing the remaining number by 100. For example:

int v = 98765499;
int m = 0;
v = Math.Abs(v); // negate negative numbers so that we can process these too
while (v >= 10) // if you want to accept single digits change this to v > 0
{
    m = Math.Max(m, v % 100);
    v /= 10;
}
Console.WriteLine(m);

We use v >= 10 because we don’t want to consider single-digit numbers.

v % 100 uses the remainder operator to give us the value left over when we divide by 100.

v /= 10 divides v by 10 and stores the result in v.

I’ve used Math.Abs( ) to make this work with negative numbers too, though you can take this line out if you only care about positive numbers.

At the end, m will either hold 0 (for single digit numbers or zero) or the highest two-digit value.

Example execution flow:

Highest v % 100 is 99.

Try it online