How do you turn a psuedocode into an appropriate code for java to understand?

[k3lvynn]

i do not understand how to return a range method from this code i made. i have the psuedocode for it, but i do not know how to turn it into a legit code. Also, can someone double check my other methods as well?

/**
 * Class to determine Car's range of miles. 
 * 
 * @author Kelvynn Cayanan 
 * @version 2/2/2014
 */
public class Car
{
    // instance variables - 
    private double miles;
    private double gallons;
    private double gas;

    /**
     * Constructor for objects of class Car
     */
    public Car()
    {
        
    }
    public Car(double initialGas)
    {
        gas = initialGas;
    }
    
    public void addGas(double gas)
    {
        // Increases amount of gas in gas tank.
        gallons = gallons + gas;
    }
    
    public void drive(double drive)
    {
        // Decreases amount of gas in gas tank.
        double newdrive = (drive/miles) - gas;
        drive = newdrive;
    }
    
    public double range(double range)
    {
        //**calculates range, the number of miles the car can travel until the gas tank is empty */
        double newrange = miles * gas;
        range = newrange;
        return range;
    }
}


here is a class that i am supposed to implement with the class i made above.

/**
 * Uses Cars.
 * 
 * @author Anthony W. Smith 
 * @version 6/15/2009
 */
public class CarUser
{
    /**
     * Constructor for objects of class CarUser
     */
    public CarUser()
    {
        Car honda = new Car(30.0);      // 30 miles per gallon
        
        honda.addGas(9.0);              // add 9 more gallons
        honda.drive(210.0);             // drive 210 miles
        
        // print range remaining
        System.out.println("Honda range remaining: " + honda.range());

        Car toyota = new Car(26.0);      // 26 miles per gallon
        
        toyota.addGas(4.5);              // add 4.5 more gallons
        toyota.drive(150.0);             // drive 150 miles
        
        // print range remaining
        System.out.println("Toyota range remaining: " + toyota.range());
    }
}

[k3lvynn]

my first class comes out clean with no syntax errors, but when i try to compile the second class, it says
" method range in class Car cannot be applied to given types;

required: double; found: no argument: reason: actual and formal argument lists differ in length

[Nepomuk]

Hi k3lvynn and welcome to bytes.com!

In your Car class you have the following function:

public double range(double range)
{
    //**calculates range, the number of miles the car can travel until the gas tank is empty */
    double newrange = miles * gas;
    range = newrange;
    return range;
}

and in your CarUser class you try to call it like this:

// print range remaining
System.out.println("Honda range remaining: " + honda.range());

So, you're trying to call the function without arguments while you defined it with an argument. From what your function definition looks like you don't really need a value to be passed though as you never read it; so you probably want to change your function definition to this:

public double range()
{
    //**calculates range, the number of miles the car can travel until the gas tank is empty */
    double newrange = miles * gas;
    double range = newrange;
    return range;
}

or alternatively (and shorter) this:

public double range()
{
    //**calculates range, the number of miles the car can travel until the gas tank is empty */
    double newrange = miles * gas;
    return newrange;
}

or even this:

public double range()
{
    //**calculates range, the number of miles the car can travel until the gas tank is empty */
    return miles * gas;
}

If your function signature (public double range(double) in this case) has values between the braces that means you'll be handing input into the function; something you don't have to here. Also, you couldn't change the value of range within the function as Java has a mixture of pass-by-reference and pass-by-value which stops you from doing stuff like that.