#include;usingnamespace std;class Airplane;{ public;void set_altitude(double new_altitude);private;double altitude;//double speed;int main();Airplane myplane;myplane.set_altitude(1000);return 0;void Airplane::set_altitude(double new_altitude) //:: scope resolution //setter, mutator;altitude = new_altitude;return;//Write a class for an airplane class with constructors, interface (mutators and accessors);// and a test driver (main). It should be able to change altitude (up,down) and speed.;//The constructor will set the altitude to 0 and speed to zero and longitude and latitude;//to Boston, Massachusetts. The overloaded constructor will set longitude and latitude;//to some numbers. If the altutude ever falls below 0 the change altutude function should;//announce the plane had crashed and the program exit. Will be checked in class