Calling methods

[Jon]

I have a class for complex numbers and an exponential function. This
event handler does not reach Expz in debug mode:

z = New Complex(CDbl(Real.Text), CDbl(Imag.Text))

Real.Text = CStr(z.Expz().GetReal())
Imag.Text = CStr(z.Expz().GetImaginary())

But when I do this

z = z.Expz()
Real.Text = CStr(z.GetReal())
Imag.Text = CStr(z.GetImaginary())

Or even this

Dim w As Complex = z.Expz()
Real.Text = CStr(z.Expz().GetReal())
Imag.Text = CStr(z.Expz().GetImaginary())

it executes the calculation and displays it. What's up here?


Jon Cosby

************************************************************
Public Class Complex
Private Shared re As Double
Private Shared im As Double

Public Sub New(ByVal x As Double, ByVal y As Double)
re = x
im = y
End Sub

Public Shared Function Expz() As Complex
Dim w As Complex

w = New Complex(Exp(re) * Cos(im), Exp(re) * Sin(im))
Return w
End Function

 

[Bart Mermuys]

Hi,

I have a class for complex numbers and an exponential function. This
event handler does not reach Expz in debug mode:

z = New Complex(CDbl(Real.Text), CDbl(Imag.Text))

Real.Text = CStr(z.Expz().GetReal())
Imag.Text = CStr(z.Expz().GetImaginary())

But when I do this

z = z.Expz()
Real.Text = CStr(z.GetReal())
Imag.Text = CStr(z.GetImaginary())

Or even this

Dim w As Complex = z.Expz()
Real.Text = CStr(z.Expz().GetReal())
Imag.Text = CStr(z.Expz().GetImaginary())

it executes the calculation and displays it. What's up here?


Jon Cosby

************************************************************
Public Class Complex
Private Shared re As Double
Private Shared im As Double

Shared means that *all* Complex objects will use the same re and im, i don't
think that's what you want, each Complex number should have its own re and
im. Remove "Shared".

Public Sub New(ByVal x As Double, ByVal y As Double)
re = x
im = y
End Sub

Public Shared Function Expz() As Complex
Dim w As Complex

Same here, The Expz must be applied to one Complex object. Shared methods
are usually called with the class name like Complex.Expz(). This is not
what you want here, remove "Shared".


HTH,
Greetings