Is there any way for the third instance to work with subtraction?
private void btnGrasieli_Click(object sender, EventArgs e)
{
/*Isto funciona
Bbanco = new Banco();
Bbanco.Valor = Bbanco.Valor - 50;*/
/*Isto funciona
Bbanco = new Banco();
Bbanco.Valor -= 50;*/
**/*Isto não funciona*/**
Bbanco = new Banco() { Valor -= 50 };
MessageBox.Show(Bbanco.Valor.ToString());
}
You have not finished declaring the variable before ; , since literal operators / values are not valid.
You can make a "Gambiarra" that organizes the code if you are using C # 3.0 +:
public static void Main()
{
Banco Bbanco = new Banco; { Bbanco.Valor -= 50; }
Console.WriteLine(Bbanco.Valor);
}
This does not make much sense since you are creating a Banco whose literal value for Valor already exists. I believe it is 0 in principle, but if you are creating another variable, why not put your value directly in it? If you want to create a bank with debt of $ 40.00 do the following:
Banco Bbanco = new Banco {Valor = -40};
Now if you create a bank from another bank, you can subtract by the same value in several ways:
Banco Bbanco = new Banco() {Valor = 125};
Banco Cbanco = new Banco() {Valor = Bbanco.Valor - 50};
Console.WriteLine("Bbanco = {0} Cbanco = {1}", Bbanco.Valor, Cbanco.Valor);
// Saídas:
// Bbanco = 125 Cbanco = 75
See working at .NET Fiddle .