Calculating the sum of all odd array indexes

Question

I want to calculate the sum of all odd array indexes, but I\'m having some trouble finding the right way to do it.

Here\'s my code so far:

    String id         


        

Answer 1

The other answer is right, you are only looping to 5. However, you're making this overly complicated; there's a neat trick you can use to avoid Integer.parseInt() and String.valueOf():

int sum = 0;

for (int i = 1; i < id.length(); i += 2) {
    sum += (id.charAt(i) - '0');
}

Also note that instead of checking i%2 repeatedly, you can simply add 2 to the loop control variable at the end of each iteration (and let it start at 1 so you hit only the odd indices).