C#•3y ago

Trying to add GrossWeight each time it shows up in the list

Trying to learn how to use a ForEach loop while doing my homework. I feel like this should be easier than it is, but basically I am trying to add the grossweight by each other every time one is found in my list. Once I do that I need to add the weight of the engine and return the whole equation sum out of the method. If more code is needed please go ahead and ask, I'll provide.

24 Replies

Servator•3y ago

you need another variable for total weight

Angius•3y ago

Create a new variable outside of the loop and keep adding to that

Servator•3y ago

grossweight changes for every object in list/array

YashogiOP•3y ago

I have one already called MaxGrossWeight should I pass that into the method?

Angius•3y ago

Why? You want to return a sum from this method

YashogiOP•3y ago

Can't I use that for total weight?

Angius•3y ago

Idk Should it store total weight?

Servator•3y ago

You can but it's unnecessary

YashogiOP•3y ago

Oh nah it doesn't just seen It's horsepower * 2000 so I need to make a new variable right above the loop Ok so I've done that You can paste code into this chat and make it look fancy right?

Servator•3y ago

$codegif

MODiX•3y ago

https://cdn.discordapp.com/attachments/364492811489509376/892176158312001586/code.gif

YashogiOP•3y ago

     private int CalculateGrossWeightOfCars() {

            int totalGrossWeight;
            
            foreach (int GrossWeight in RailCars) {
                GrossWeight += GrossWeight;
            }
        }

     private int CalculateGrossWeightOfCars() {

            int totalGrossWeight;
            
            foreach (int GrossWeight in RailCars) {
                GrossWeight += GrossWeight;
            }
        }

Angius•3y ago

Yep

YashogiOP•3y ago

Didn't turn out that good but we learning

Angius•3y ago

Well, you're not using this variable yet

YashogiOP•3y ago

Yeah

Angius•3y ago

You'll need some starting value for it. 0 would seem reasonable Then, in the loop, keep adding to that variable

YashogiOP•3y ago

Ok so I need my total weight to basically take in my grossweight each time

Angius•3y ago

Instead of to GrossWeight

YashogiOP•3y ago

Would it be totalGrossWeight += GrossWeight?

Servator•3y ago

also you need to return totalGrossWeight yeah

YashogiOP•3y ago

Ahh ok And now for the last part my engine is a class that has a Weight given in the constructor I thought passing in Engine.Weight would fit in my method but it says it cannot find it in context, my guess is that it's set to readonly?

 public class Engine
    {
        public readonly string Model;
        public readonly string SerialNumber;
        public readonly int Weight;
        public readonly int HorsePower;

        public Engine(string model, string serialNumber, int weight, int horsePower) {

 public class Engine
    {
        public readonly string Model;
        public readonly string SerialNumber;
        public readonly int Weight;
        public readonly int HorsePower;

        public Engine(string model, string serialNumber, int weight, int horsePower) {

Angius•3y ago

It's a field of Engine When you're trying to set the weight of an engine, which engine's weight do you want to set? You need an instance, a specific engine that can have weight A class is just a blueprint, so to speak. The actual object is the instance of a class Besides that, yes, those fields are readonly, so they can only be set from the ctor

YashogiOP•3y ago

Ahh ok My engine only has one Weight Compared to my train which has multiple

 public Train(Engine engine) {
            Engine = engine;
            RailCars = new List<RollingStock>();
        }

 public Train(Engine engine) {
            Engine = engine;
            RailCars = new List<RollingStock>();
        }

I have this passed into my train program I just don't know what would be necessary to grab the weight from the engine class Sorry if I sound like a noob I started c# 6 months ago I think I'm close to figuring out the rest from here, thanks for the help guys It made much more sense when I realized I had to initialize the variable first.

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Trying to add GrossWeight each time it shows up in the list