What’s wrong with my code for summing odd-indexed elements?

It looks like you might be adding values from even indices instead of odd ones. Since arrays start at 0, index 0 is even, so you'll want to start from index 1 and increase by 2 each time to get the odd-indexed elements.

The key issue here is in how you're interpreting the term "odd-indexed". Since arrays are 0-based, index 1 is the first odd index. So your loop should begin at i = 1 and then add 2 with each iteration to sum up the odd-indexed positions.

You're starting at i = 0 in your loop and incrementing by 2. This means you're summing values at 0, 2, 4, etc. Instead, begin at i = 1 and then add 2 to sum the odd-indexed values. Also, rather than creating a large array, just define one that fits the number of elements you need.