C#•9mo ago

addition problem

c# visual studio community windows forms app

20 Replies

rahkeioOP•9mo ago

trying to take an int from balance but it tells me to make it string instead how do i convert string to int

Pobiega•9mo ago

How do you store the balance?

rahkeioOP•9mo ago

just a label

Pobiega•9mo ago

Right. You should separate your data from where/how you display it labels display strings. You dont want to be converting back and forth when manipulating your data. Much better to store the balance in a numeric variable, and just display it in the label

rahkeioOP•9mo ago

is there a way to like just take the numbers from the label or is that the only wayh

Pobiega•9mo ago

There is a way, but I'm trying to teach you something important here :p

rahkeioOP•9mo ago

ok thx ill look into it

Pobiega•9mo ago

The best way would be with a property, a backing field and a custom setter that also updates the label. Do you know what properties, fields and setters are?

rahkeioOP•9mo ago

uhh no i only learned the basics a few days ago and i wanted to make a simple game out of it

Pobiega•9mo ago

private int _balance;

public int Balance
{
    get => _balance;
    set
    {
        _balance = value;
        balanceLabel.Text = $"Balance: {_balance}";
    }
}

private int _balance;

public int Balance
{
    get => _balance;
    set
    {
        _balance = value;
        balanceLabel.Text = $"Balance: {_balance}";
    }
}

whenever you want to change the players balance, you just do it via the property, like so: Balance = 500; or Balance += 100; it will update the variable and also update the label

rahkeioOP•9mo ago

cool! if you have the time can you break down whats happening its ok if u cant

Pobiega•9mo ago

private int _balance; is the declaration of a field. we also give it the modifier "private" so that nothing outside the form can see/access it the rest is the property declaration. We give it a "public" modifier, which means other pieces of code can see and interact with it inside that property declaration, there are two important parts, the getter and the setter the getter, we just say "hey, when getting the value, just take the value from the _balance field" the setter does the same, but for writing - it updates the value in the private field, setting it to the value given. note how value shows up as a keyword here. then the last line just updates the label, as I'm sure you already know how to do but we do that as part of the setter in the property, so that we dont have to remember to do it everytime/where we change the value

rahkeioOP•9mo ago

thanks alot this really hellped helped 😁 one question what is private used for?

Pobiega•9mo ago

we also give it the modifier "private" so that nothing outside the form can see/access it

rahkeioOP•9mo ago

why wouldnt we want the others not to see it?

Pobiega•9mo ago

because then they could set the balance directly, instead of going via the property and then your label would not be updated

rahkeioOP•9mo ago

kk thanks

MODiX•9mo ago

Pobiega

REPL Result: Success

var account = new Account();
account.Balance = 100;
account.PrintBalance();
account._balance = 200;
account.PrintBalance();

public class Account
{
    public int _balance;

    public int Balance
    {
        get => _balance;
        set
        {
            _balance = value;
            Console.WriteLine($"Balance changed to {_balance}");
        }
    }

    public void PrintBalance() => Console.WriteLine("Current balance: " + _balance);
}

var account = new Account();
account.Balance = 100;
account.PrintBalance();
account._balance = 200;
account.PrintBalance();

public class Account
{
    public int _balance;

    public int Balance
    {
        get => _balance;
        set
        {
            _balance = value;
            Console.WriteLine($"Balance changed to {_balance}");
        }
    }

    public void PrintBalance() => Console.WriteLine("Current balance: " + _balance);
}

Console Output

Balance changed to 100
Current balance: 100
Current balance: 200

Balance changed to 100
Current balance: 100
Current balance: 200

Compile: 502.125ms | Execution: 88.047ms | React with ❌ to remove this embed.

Pobiega•9mo ago

as you can see, if _balance is public, we can use it and we dont get the "balanace changed" message

tatoie dardmeladze•9mo ago

if you did not get it you can try to watch bor code getters and setter it preatty much nails it

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addition problem

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