This doesn't look right:

    if (temp == sum){
        // do A
    } else if (temp != sum) {
        // do B
    } else {
        // do C
    }

Because:

 If temp == sum is true, then temp != sum is false.

 If temp == sum is false, then temp != sum is true.

So you will always fall in the "if" or the "else if" block.

The "else" block is unreachable.

In other words, the "// do C" part is never executed.