I have an error...pls help!!

Question

so this is the question:
The task is to write a class that simulates a car. When an oject of
this class is created, one must supply
- The capacity of the fuel tank in gallons.
- The fuel efficiency in miles per gallon;
Newly manufactured cars have empty fuel tanks.
The car will include the following displays (functions):
-a fuel guage, giving a number between 0.0 and 1.0 indicating how much
fuel is left in the tank.
-on odometer, giving the total number of miles the car has travelled.
The car should also support the following operations (procedures)
-fill the fuel tank
-drive a certaion mr of miles, consuming fuel. If there is insufficient
fuel to drive the whole distance, drive until the fuel is exhausted.
(You may wixh to use Math.min or Math.max to implement this part)
class car{
     int capacity;
     int fuelEfficiency;
     float meter;
     double miles;
     public car(int c, int f, float meter, double miles)
          capacity = c;
          fuelEfficiency = f;
          meter = 0;
          miles = 0;
     public int getFuelLeft()
     return (fuelEfficiency/capacity);
     public double getMilage()
     return miles;
     public void setCapacity()
          capacity = fuelEfficiency;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
class cardemo{
     public static void main (String[] args) throws IOException{
     BufferedReader reader = new BufferedReader (new InputStreamReader(System.in));
     Car mycar = new Car(c,f,meter,miles);
     //menu
     System.out.println("1. Input capacity.");
     System.out.println("2. Input fuel efficiency.");
     System.out.println("3. View fuel guage.");
     System.out.println("4. View odometer.");
     System.out.println("5. Fill the tank.");
     System.out.println("6. Drive a certain number of miles.");
     System.out.println("7. Exit.");
     int choice = 0;
     while(choice != 7 ) // 7 = exit
          System.out.println("INPUT YOUR CHOICE");
          choice = Integer.parseInt(reader.readLine());
          switch(choice)
               case 1:
               System.out.println("Input capacity of the fuel tank in gallons");
               int capacity = Integer.parseInt(reader.readLine()); // capacity input
               break;
               case 2:
               System.out.println("Input fuel efficiency in miles per gallon");
               int fuelEfficiency = Integer.parseInt(reader.readLine()); // fuel efficiency input
               break;
               case 3:
               System.out.println("View fuel guage.");
               System.out.println("Fuel left in tha tank: "+mycar.getFuelLeft());
               case 4:
               System.out.println("View odometer.");
               System.out.println("Total number of miles the car has travelled: "+mycar.getMiles());
               case 5:
               System.out.println("Fill the tank.");
               System.out.println("The fuel tank is full :"+mycar.setCapacity());
               case 6:
               System.out.println("How much miles would you like to travel.");
               double miles = Integer.parseInt(reader.readLine()); // miles input
               double drive = miles/fuelEfficiency; // gallons needed to finish journey
               if (drive > capacity) //gallons needed to finsh journey is more than gallon capacity
                    System.out.println("There is no sufficient fuel to drive the whole distance.");
                    System.out.println("Your car will drive until the fuel is exhuasted.");
                    //upgrade odometer (miles) (adek trid tamila)
                    System.out.println("Your car will be able to drive "+miles+" miles.");
                    drive = drive - capacity; //gallons needed to continue journey
                    System.out.println("You will need "+drive+" more gallons to drive "+miles+" miles.");
               else
                    System.out.println("You have sufficient fuel to drive the whole distance.");
                    drive = capacity - drive; //gallons left in tank
                    System.out.println("You have "+drive+" gallons of fuel left to use.");
               default:
               System.out.println("Invalid choice number.");
               break;
i am getting this error in the main:
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : class Car
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : class Car
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : variable c
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : variable f
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : variable meter
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
C:\Documents and Settings\Francis Cutajar\Desktop\cardemo.java:10: cannot find symbol
symbol : variable miles
location: class cardemo
     Car mycar = new Car(c,f,meter,miles);
     ^
6 errors
can you please tell me how i shoul code it =]

Answer 1

PoisonGirl wrote:
so it should be like this: car mycar = new car(...);
although im still getting an error in (c,f,meter,miles)
where am i wrong?lots of places. more to follow...
1) Your Car constructor takes a meter parameter. What's that?
2) Why pass a miles variable into the Car constructor? Won't that always be zero on construction, so a parameter is unnecessary?
3) Since you need some data present before you can construct a car, you will likely need to collect the data from the user before trying to construct car.
4) You can't just pass variables to a method or constructor when the variables simply do not exist.
5) You need to learn the technique of incremental programming where you create your program in little steps, adding only a small amount of code and then not adding any more until the code present compiles. It looks like you kept adding code to a doomed program increasing your number errors umpteen fold.
Edited by: Encephalopathic on Aug 18, 2008 3:15 PM