gistfile1.java

import java.util.Scanner;

class Car
    {
    //instance variables
    double start, end, galls;
    //constructor
    Car(double start, double end, double galls)
        {
        this.start=start;
        this.end=end;
        this.galls=galls;
        }
    //methods
    double mpg()
        {
        return (end-start)/galls;
        }
    boolean gasHog()
        {
        if(new Car(start,end,galls).mpg()<15)
            {
            return true;
            }
        return false;    
        }
    boolean economyCar()
        {
        if(new Car(start,end,galls).mpg()>30)
            {
            return true;
            }
        return false;
        }
    }
    
class thirtyone1
    {
    public static void main (String[] args)
        {
        //get data
        Scanner keyboard=new Scanner(System.in);
        System.out.println("Enter first reading!");
        double start=keyboard.nextDouble();
        System.out.println("Enter second reading!");
        double end=keyboard.nextDouble();
        System.out.println("Enter gallons!");
        double galls=keyboard.nextDouble();
        
        //create car object and call methods
        Car car1=new Car(start,end,galls);
        System.out.println("\nMiles per gallon: "+car1.mpg());
        if(car1.gasHog()==true)
            {
            System.out.println("Gas Hog!");
            }
        if(car1.economyCar()==true)
            {
            System.out.println("Economy Car!");
            }
        }
    }