tollbooth program

actually the problem is that i have to make a program for tollbooth
the format is cars passing the booth are expected to pay 50 cent toll. mostly they do but sometimes a car goes without paying. the tollbooth keeps track of the number of cars that have gone by, and of the total money collected.
i hav to use two data members one for total number of cars and the other for the total cash.
a member function payingcar() increments the car total and adds 0.50 to the cash total. anothjer member function called nopaycar() increments the car total but adds nothing to total cash.
i have to use one key to count a paying car and another key to count a non paying car. pushing Esc should cause the program to print out the total cars and total cash.
kindly guide me in these fields
1. give a hint of material of member functions
2. how to use keys for paying and non paying cars bcz i have used only numbers yet
3. what for Esc button bcz it does not appears in the editor

All the information you need is there and is easy to follow.

Show what you have attempted so far and what is not working and I am sure somebody will help.

Code:

---

# include <iostream>
# include <conio.h>
using namespace std;
class tollbooth
{
private:
        long int total_cars;
        float total_cash;
public:
        void payingcar()//inline function
        {
                total_cars++;
                total_cash+=0.50;
       
        }//end of function
        void nonpayingcar()//inline function
        {
                total_cars++;
        }//end function

        void print () const//inline function
        {
                cout<<"total cars passed:"<<total_cars<<endl;
                cout<<"total cash received:"<<total_cash<<endl;
       
        }//end function


};//end class
int main ()
{

        tollbooth lahore;
        char push_key,a,b;
        if (push_key==a)
        {
                lahore.payingcar();
       
        }//end if
        else if (push_key==b)
        {
                lahore.nonpayingcar();
        }//end else
       
        getch ();
       
       

}//end main

---

now the problem is which loop should i use and when i press "a" my compilor gives a statement and gives two options "continue" "break"

You are not obtaining any input? Are you familiar with 'cin'? I would recommend using that.

Code:

---

# include <iostream>
# include <conio.h>
using namespace std;
class tollbooth
{
private:
        long int total_cars;
        float total_cash;
public:
        void payingcar()//inline function
        {
                total_cars++;
                total_cash+=0.50;
       
        }//end of function
        void nonpayingcar()//inline function
        {
                total_cars++;
        }//end function

        void print () //inline function
        {
                cout<<"total cars passed:"<<total_cars<<endl;
                cout<<"total cash received:"<<total_cash<<endl;
       
        }//end function


};//end class
int main ()
{
        tollbooth lahore;
        char push_key;
        cin>>push_key;
        do
        {
        if (push_key=='1')
        {
                lahore.payingcar();
       
        }//end if
        if (push_key=='0')
        {
                lahore.nonpayingcar();
        }//end else
                cin>>push_key;
        }//end do
       
        while (push_key!='3');
       
                lahore.print ();
       

        getch ();
       
       

}//end main

---

now i have corrected my program but when i push "3" it displays address not the number of cars and cash kindly guide me.
actually darren i was focusing on class object and member functions thats why i forgotten and that was really funny.
kindly help me

It is because you are not initialising your two variables when you create the tollbooth object.

Have you learnt about constructors yet? My suggestion is to create a default constructor that sets both your variables to zero when you create a new tollbooth instance.

i have written constructor and it is now working.
i know but according to my knowledge compiler calls a default constructor and intializes the data members itself.

Quote:

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Originally Posted by rafay_07

i have written constructor and it is now working.
i know but according to my knowledge compiler calls a default constructor and intializes the data members itself.

---

That's incorrect. If, when you create an instance of a class, you need to initialise data members, then you need to declare a constructor. Otherwise the information stored in the memory locations of those data members will simply be garbage and is what you were seeing as output before you wrote a constructor. If your class has no data members then an implicit compiler generated constructor would generally be fine.

darren many many thanks, u really solved my problem