How to correctly formulate the condition?

Question

C++ / C#

Hello. The essence of the question is this: there is some sequence of numbers, and you need to find local maxima, while they cannot be the initial and final values. And so, how it is correct to write in if about final value? Arrays cannot be used. I know it's a stupid question, but I just can't figure it out.

...
while (c != 0) {
    count++;
    if (count > 1 && a < b && b > c && ...)
...

Answer 1

If it is possible to count the number of elements: count < sequence length - 1
If not, then calculate with a delay of 1 element, and do not count the current one.