find a sequence consecutive or not

Hello forum,

I am having trouble to formulate a simple algorithm.Check the following sequence:

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2
3

s = {....... 4,5,6,7,8,9................}



How to find a sequnce that is consecutive or not ?


Thanks

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for( some counter; counter < sequence.length(); ++counter )
{
    if( sequence[counter] == sequence[counter+1] - 1)
        do something
    else
        do another thing
}
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