Storing a instance/object in a array

Question

I am creating a console zombie survival game that is suppose be random and be fairly complex, such as finding multiple weapons, and ammo types. However, I believe that I could save an object in array to use it again later, for correct information, but this way does not work.

I have tried looking of storing objects in arrays with no luck. I have tried to change the arrays from Item based to Object based with no luck.

class Firearm : Weapon
    {
        public Firemode firemode;
        public int maxCapacity;
        public int curCapacity;
        public Type type;
        public Caliber caliber;

        public Firearm (string _name, float _damage, int _range, Firemode 
_firemode, int _maxCapacity, int _curCapacity, Type _type, Caliber 
_caliber)
        {
            name = _name;
            damage = _damage;
            range = _range;
            firemode = _firemode;
            maxCapacity = _maxCapacity;
            curCapacity = _curCapacity;
            type = _type;
            caliber = _caliber;
        }

        public void FirearmStats()
        {
            Console.WriteLine("\n Name: {0}\n Damage: {1}\n Range: {2}\n 
Firemode: {3}\n Max Capacity: {4}\n Current Capacity: {5}", name, damage, 
range, firemode, maxCapacity, curCapacity);
        }
    }


static void Main(string[] args)
    {
        Random numberGenerator = new Random();
        //Pistols
        Firearm m9 = new Firearm("Beretta M9A1", 34.0F, 30, 
Firemode.SemiAutomatic, 15, numberGenerator.Next(1, 16), Type.Pistol, 
Caliber.nine);
        ....
        Item[] inventory = new Item[14];
        Item[] equipped = new Item[0];
        .....
        equipped[0] = m9;
        Console.WriteLine("\nYou find a {0}", equipped[0].name);

        //issue here with equipped[0]^^^
        equipped[0].FirearmStats();

        //and here ^^^^^
        player.Command();
    }

Severity Code Description Project File Line Suppression State Error CS1061 'Program.Item' does not contain a definition for 'FirearmStats' and no accessible extension method 'FirearmStats' accepting a first argument of type 'Program.Item' could be found (are you missing a using directive or an assembly reference?) ZombieConsoleGame E:\Visual Studio Projects\ZombieConsoleGame\ZombieConsoleGame\Program.cs 158 N/A

JayV · Accepted Answer · 2019-06-21 05:50:21Z

1

I am assuming the Weapon class inherits from your Item class.

Because the array equipped is of type Item, you need to cast the Item to a Weapon before you can call any of the methods/functions on the Weapon class.

Alter this line (where you highlighted the problem) equipped[0].FirearmStats();

to be:

((Firearm)equipped[0]).FirearmStats();

This will cast the Item to be a Firearm and then allow you to use it as a Firearm.

Edit:

In addition, the line:

Item[] equipped = new Item[0];

Will create an Array variable with Zero elements within it, no space has been allocated to store the items you are equipped with. Change the zero in [0] to be a positive number like you already have in the previous line for inventory (Item[] inventory = new Item[14];)

edited Jun 21, 2019 at 5:50

answered Jun 20, 2019 at 22:41

JayV

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8 Comments

user2819245 Over a year ago

Side note/nitpick: It is not Weapon but FireArm which declares the FirearmStats method ;-)

matthewgreen Over a year ago

I thought this would work after seeing it, but it did not. Then I thought I should change it to the cast as Firearm instead. This got rid of any errors till I ran it. In the console it says "Unhandled Exception: System.IndexOutOfRangeException: Index was outside the bounds of the array. at ZombieConsoleGame.Program.Main(String[] args) in E:\Visual Studio Projects\ZombieConsoleGame\ZombieConsoleGame\Program.cs:line 157". I also tried changing the array to be of Weapon or Firearm but got the same error message in the console when running it.

user2819245 Over a year ago

@SubaruDanyBoon, pay attention to what the IndexOutOfRangeException tells you. Don't just blind-guess the problem, read the problem description given to you by the exception...

matthewgreen Over a year ago

I have no clue why its saying that, should it not be within range, because the index is within range of the array size.

user2819245 Over a year ago

@SubaruDanyBoon, what is the actual array size?

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