Maybe sometimes, but not this time. The author named their pair "Coordinate". In math and in computer graphics there’s widely known convention the fields of Ca

Maybe sometimes, but not this time. The author named their pair "Coordinate". In math and in computer graphics there’s widely known convention the fields of Cartesian coordinates are named x/y and not a/b. When you’ll start writing code that use and/or modify those Coordinate values, meaningful names in C++ source and in the debugger help a lot.