c# constructor chaining

Hello,

What does :this(0) mean ??   at line 10



using System;

namespace Teller03 {
  class Teller {
    public const int minValue = 0;
    public const int maxValue = 5;
    private int curValue; // default value 0

    public Teller()
      : this(0) { // explicit parameterless constructor
    }/*Teller*/

    public Teller(int initValue) {
      curValue = initValue;
    }/*Teller*/

    public int GetCurrentValue() { // accessor - getter
      return curValue;
    }/*GetCurrentValue*/

    public void SetCurrentValue(int newValue) { // mutator = setter
      if ((minValue <= newValue) && (newValue <= maxValue)) {
        curValue = newValue;
      }
    }/*SetCurrentValue*/

    public void Increment() {
      curValue++;
    }/*Increment*/

    public void Decrement() {
      curValue--;
    }/*Increment*/
  }/*Teller*/
}/*Teller03*/

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kensy11Asked:
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Imran Javed ZiaConsultant Software Engineer - .NET ArchitectCommented:
Hi,

When you will make an instance of Teller withn default constructor (constructor with no parameter) then it will first call parameter with int parameter and therefore you may get curValue equal to 0.

Teller t = new Teller();
MessageBox.Show(t.GetCurrentValue().tostring()); // will show you 0

Thanks

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käµfm³d 👽Commented:
It means the current constructor (line 9) is going to invoke the constructor which has a matching signature as what is being called in line 10. In this case, the constructor in line 13 will be invoked. Line 13's constructor will complete its initialization(s) (execution) before continuing with the logic within line 10's constructor.
IronhoofsCommented:
The Teller function without parameters calls Teller(int initValue) with value 0. Its a "nice to have", without it you would be forced to allways create Teller objects with a initial value (new Teller(0);)
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C#

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