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java help pls!

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logicfail182
Please understand that I don't expect you to do my work; I was just hoping that after 2 days of work someone could point me in the right direction.

This is my code.
any help would be much appreciated.
Here's the assignment:
http://pavao.org/compsci/apcs/WebLessons2/LessonA4/Lab-A4-1.html

Here's the code:
public class Car{

int start;
int end;
double gasUsed;
public void car(int odometerReading){
}


public void fillUp(int odometerReading, double gallons){

}

public double calculateMPG(){
calculateMPG = odometerReading - start / gallons;
}

public double resetMPG(){
start = odometerReading;
}

public void calculate(){
Car auto = new Car(15);
System.out.println("New car odometer reading: ");
auto.fillUp(150, Cool;
System.out.println("Miles per gallon" + auto.calculateMPG());
System.out.println("Miles per gallon" + auto.calculateMPG());
auto.resetMPG();
auto.fillUp(350, 10);
auto.fillUp(450, 20);
System.out.println("Miles per gallon" + auto.calculateMPG());
auto.resetMPG();
auto.fillUp(603, 25.5);
System.out.println("Miles per gallon" + auto.calculateMPG());
}
}

[/code]
Peterssidan
I wrote it so that it gives the same output as the "Sample Output". resetMPG returns a double but what value is that? I don't know.
A tricky thing is the fillUp method. Note that the myEndMiles is set to the new value but the myGallonsUsed is added on top of the old value.

Code:
public class Car {

   int myStartMiles;
   int myEndMiles;
   double myGallonsUsed;

   public Car(int odometerReading) {
      myStartMiles = odometerReading;
      myEndMiles = 0;
      myGallonsUsed = 0;
   }

   public void fillUp(int odometerReading, double gallons) {
      myEndMiles = odometerReading;
      myGallonsUsed += gallons;
   }

   public double calculateMPG() {
      return (double)(myEndMiles - myStartMiles) / myGallonsUsed;
   }

   public double resetMPG() {
      myStartMiles = myEndMiles;
      myGallonsUsed = 0;
      
      return 0.0; // what should be returned?
   }

   public static void main(String[] args) {
      Car auto = new Car(15);
      System.out.println("New car odometer reading: ");
      auto.fillUp(150, 8);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(350, 10);
      auto.fillUp(450, 20);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(603, 25.5);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
   }
}
raneez_n
This coding is better than the first one..
And i think the reset method does not need to return any values..it just reset the previous values.
Peterssidan wrote:
I wrote it so that it gives the same output as the "Sample Output". resetMPG returns a double but what value is that? I don't know.
A tricky thing is the fillUp method. Note that the myEndMiles is set to the new value but the myGallonsUsed is added on top of the old value.

Code:
public class Car {

   int myStartMiles;
   int myEndMiles;
   double myGallonsUsed;

   public Car(int odometerReading) {
      myStartMiles = odometerReading;
      myEndMiles = 0;
      myGallonsUsed = 0;
   }

   public void fillUp(int odometerReading, double gallons) {
      myEndMiles = odometerReading;
      myGallonsUsed += gallons;
   }

   public double calculateMPG() {
      return (double)(myEndMiles - myStartMiles) / myGallonsUsed;
   }

   public double resetMPG() {
      myStartMiles = myEndMiles;
      myGallonsUsed = 0;
      
      return 0.0; // what should be returned?
   }

   public static void main(String[] args) {
      Car auto = new Car(15);
      System.out.println("New car odometer reading: ");
      auto.fillUp(150, 8);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(350, 10);
      auto.fillUp(450, 20);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(603, 25.5);
      System.out.println("Miles per gallon: " + auto.calculateMPG());
   }
}
blueray
This is my version but added a bit other stuffs.
implemented it c# first and then converted back to java.
Cause I have no java installed at all.

Code:

public class Car
{
   private int myStartMiles;
   private int myEndMiles;
   private double myGallonsUsed;

   public Car(int odometerReading)
   {
      this.myStartMiles = odometerReading;
      this.myEndMiles = 0;
      this.myGallonsUsed = 0;
   }

   public void fillUp(int odometerReading, double gallons)
   {
      this.myEndMiles = odometerReading;
      this.myGallonsUsed += gallons;
   }

   public double calculateMPG()
   {
      if (this.myEndMiles > this.myStartMiles)
      {
         return (double)(this.myEndMiles - this.myStartMiles) / this.myGallonsUsed;
      }
      return 0;
   }

   public double resetMPG()
   {
      this.myStartMiles = this.myEndMiles;
      this.myGallonsUsed = 0;
      return this.myStartMiles;
   }
}

public class test
{
   //public static void Main(string[] argv) // C# header
   public static void main(String[] argv) // Java header
   {
      Car auto = new Car(15);
      Console.WriteLine("New car odometer reading:");
      auto.fillUp(150, 8);
      Console.WriteLine("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(350, 10);
      auto.fillUp(450, 20);
      Console.WriteLine("Miles per gallon: " + auto.calculateMPG());
      auto.resetMPG();
      auto.fillUp(603, 25.5);
      Console.WriteLine("Miles per gallon: " + auto.calculateMPG());
      
   }
}
The-Nisk
What a chunky & awkward looking code Shocked
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