No third-party services! Why would I do that through a third-party service if I can do that without it? After all, how those third-party services do that? They use the standard way. So I want to find out what this way is and use it too.
You should code something like this:
long balance = 0;
for ( int i = 0; !atEnd ( ); i++ )
......
}
That doesn't make sense. If what language is this? How can I run it?