const int unit car = 10； //Declare three constants
const int unittruck = 25
const int unit bus = 15；
Class Free // define classfree.
{
Int car, cafe//define six class member integer variables.
International truck transportation fee;
int bus，busfee
Public:
The Free() // constructor (with the same name as the class) initializes the related variables.
{
car = car fee = truck = truck fee = bus = bus fee = 0；
}
Void cars() // defines a class public member function, the same below.
{
car++；
carfee+= unit car；
}
Invalid truck ()
{
truck++；
truck fee+= unit truck；
}
Invalid bus ()
{
bus++；
bus fee+= unit bus；
}
Invalid process ()
{
int no，n = 0；
Cout & lt& lt" 1: bus 2: truck 3: bus 0: exit "< & ltendl// output (similar to printf)
while ( 1)
{
cout & lt& lt" " " & lt& lt++ n & lt； & lt"- Model: ";
CIN & gt； & gt No; //input
Switch (No)
{
Case 0: broken;
Case1:cars (); Break;
Case 2: truck (); Break;
Case 3: Bath (); Break;
Default value: cout & lt& lt "Wrong vehicle type input!" & lt& ltendl
}
if(no = = 0)break；
}
}
Empty display ()
{
Cout & lt& lt "The cost statistics are as follows:"
Cout & lt& lt "Bus:" << Car<& lt "Subtotal of vehicle expenses:" < & ltcarfee & lt& ltendl.
Cout & lt& lt "Truck:"
cout & lt& lt" Bus:" < & lt； Bus<& lt "Subtotal of vehicle expenses:" < & ltbusfee & lt& ltendl.
Cout & lt& lt "Total cost:"
}
};
void main()
{
Free obj// Define object obj
obj . process()； //Call the public function of the obj object
obj . display()；
}