How to use functions the are home made. Topic is solved

[omahdezavalos]

I want to create a function and calculate the transformation from mm to thousands of the inches, like...declare in Main.h and defined in main.cpp

double convert(double dim)
{
return (dim * 39.37);
}

then if I try to do:

conv<<convert(d_mm);

give an error undefined reference to TESTFrame::convert(double),
error: ld returned 1 exit status
if I kept conv<<d_mm * 3937 it work

• void TESTFrame::OnButton2Click(wxCommandEvent& event)
  {
  double d_mm = 0.0;
  wxString conv = wxT("");
  if(TextCtrl4->GetValue().ToDouble((&d_mm)))
  {
  
  conv<<d_mm * 39.3700787401575; //code to become a function.................. conv<<convert( d_mm); //trow an error
  TextCtrl5->SetValue(conv);
  }
  else{
  wxMessageBox((wxT("There is a error OnButton2Click .....")));
  }
  
  
  }

[doublemax]

Please show the definition and declaration of that function in context.

From the error message it looks like you declared "convert" as a class method for TESTFrame, but you defined it in global scope.

If you intended to make it a class method, it should look like this:

Code: Select all

double TESTFrame::convert(double dim)
{
  return (dim * 39.37);
}

[omahdezavalos]

Wow, you are right in the debugging genius category, that was really good.