... register it. Thanks.Another ExampleMuch of what you learn about functions and C++ structures carries over to C++ classes, soit's worth looking at a second example. This time we deal with ... structures.RecursionAnd now for something completely different. A C++ function has the interestingcharacteristic that it can call itself. (Unlike C, however, C++ does not let main() call itself.) This ability ... returns a travel_time structure, you can use it as anargument for the show_time() function. Because C++ functions, by default, passarguments by value, the show_time(sum(trip, day3)) function call...