Inheritance problem (default constructor error)

hey guys im new here and new to programming in C++
i have this project for school and ive hit a dead end.

included i have attached the header, functions cpp, and driver cpp files

when building i get the following error :error C2512: 'automobile' : no appropriate default constructor available

now ive read the other thread in here about that same error but, the difference is that i dont have a class within a class, they are inherited classes.

any help would be extremly appreciated!!!!!!!

thx guys

Try to separate arguments in automobile, put them in private and rewrite automobile constructor. I think this may work out for you...

but i need all of the arguments in each other the classes (planes trains and automobiles) to stay in each of the respective constructors, the values come from the base class vehicles. i still dont really understand the nature of the error.

You've included a workspace (dsw) file but no project file (dsp). You need to post all your project's files for people to examine it properly.

Mind you.... one very obvious problem is that in function main() you write:-

Code:

---

        automobile myauto;

---

which means you call a constructor with no parameters. However, you don't have any constructor with no parameters. Your only constructor for automobile takes 4 parameters and you must supply these whenever you instantiate an automobile object.

Oh - and apart from that, you've misunderstood the way that parameters are used in function calles - e.g.

Code:

---

automobile::automobile(double mpg, double fuelcap, int ftype, int tolls) : vehicle(mpg, fuelcap, ftype)
{
        tolls = 25;                // This is wrong!!
        tollfees = tolls;        // This is right
        mpg = 20;                // This is wrong!!
        fuelcap = 15;                // and so is this!!
        ftype = 0;                // and so is this!!
}

---

The basic idea of parameters is that they pass values into your constructor (or your function). Sometimes they can be used to return values out of a function but that wouldn't work with the type of parameter you've set up. What you did in the constructor for vehicle:-

Code:

---

vehicle::vehicle(double mpg, double fuelcap, int ftype)
{
        milespergallon = mpg;
        fuelcapacity = fuelcap;
        fueltype = ftype;

        // ....
}

---

This is the correct way to use parameters - but what you did in the constructor for automobile would achieve nothing.

thank u so much john e i will edit my code and update with the results. i apreciate the help alot man! im so used to vb which was pretty straight forward with functions and passing arguments.