/** Code for a car which can drive, and fill up w/ gas.
 * @author Ian Barland
 * @version 2008.Sep.22
 */
class Car {
    
    
    public static void main() {  System.out.println("hi"); }
    
    double currGas;
    double odometer;
    double mileage;
    
    /** Constructor.
     * @param _mileage The new car's mileage (in miles per gallon).
     */
    public Car( double _mileage ) {
        currGas = 0.0;
        odometer = 0.0;
        mileage = _mileage;
        }
    
    /** Fill up with gas.
     * @param numGals The number of gallons to add to the tank.
     */
    public void addGas( double numGals ) {
        double updatedGasLevel;
        updatedGasLevel = currGas + numGals;
        currGas = updatedGasLevel;
        }
    
    /** Record that the car has been driven.
     * @param miles The number of miles driven.
     */
    public void drive( double miles ) {
        currGas = currGas - miles/mileage;
        }
        
    /** Return how much gas remains in the tank (in gallons).
     * @return how much gas remains in the tank (in gallons).
     */
    public double getGasInTank() {
        return currGas;
        }
    
    }