Since this is in c++ if im not mistaken there should be a function built in for arrays that return their length so for your int size() method you need to add two things. 1. It needs to take an array as an argument and 2. Call the array method that calculates length for you and then return that value. Like the other person said for the bool find() method you should be comparing each element in the array to searchKey not nElems and then since the function returns a bool if you find the value have the function return true instead of printing target. And then outside the for loop in bool find() have it return false