Re: Dev C++

From:

=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?= <Erik-wikstrom@telia.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 20 Apr 2008 18:30:35 GMT

Message-ID:

<fZLOj.6341$R_4.4841@newsb.telia.net>

On 2008-04-20 20:22, Erik Wikstr??m wrote:

On 2008-04-20 18:50, Crazy c wrote:

I have hit an error that I do not understand. That is one thing about
Dev that I do not like, I cannot understand the errors. There should
be a course in Dev errors. It is pretty straightforward; I am checking
that the real and imginary parts of a Complex Number are not equal to
0 (division). In (a,b)/(c,d), if c && d = 0; I want to display an
error message and return to the program.

ComplexNumber &ComplexNumber :: operator/ (const ComplexNumber & c1)
{
              //check for c & d = 0
              if (c1.getReal()== 0 && c1.getImag()== 0) {
                  cout << "The Complex Number used for your
denominator cannot contain 0 for the real AND
the imaginary part" << endl;
                  return 1;// this generates the error
                  }

              ComplexNumber complxSum;
              double s;
              //for s
              s = ((this -> getImag() * this -> getImag()) +
(c1.getImag() * c1.getImag()));
              //divide
              complxSum.setReal ( ((c1.getReal() * this -> getReal())
+ (c1.getImag() * this -> getImag())) /s);
              complxSum.setImag ( ((c1.getReal() * this -> getImag())
- (c1.getImag() * this -> getReal())) /s);

              return complxSum;
}//end operator/

//error from Dev
102 C:\Documents and Settings\cbrown\My Documents\DSCmplxNum
\ComplexNumber.cpp invalid initialization of non-const reference of
type 'ComplexNumber&' from a temporary of type 'int'

Any ideas as to why the return does not work or what the error
designates?

As the error message states the / operator returns a reference to a
ComplexNumber object. However you return 1, which will be used to
construct a ComplexNumber object (with the value 1+0i, I would assume).
This object will be a temporary, and you can not bind a reference to a
temporary (you can bind const references to temporaries though).

Actually, I'm assuming a bit to much here, as Sam pointed out, you are
trying to return an int when a reference to a ComplexNumber is expected
which does not work. Anyway, the solution is still the same.

--
Erik Wikstr??m