C++ Operator Overload relational expression == to Complex class

#include <iostream>
using namespace std;
// declaration section
class Complex//from  w ww  .  j av a 2s.  c  om
{
   private:
   double realPart;       // declare realPart as a double variable
   double imaginaryPart;   // declare imaginaryPart as a double variable
   public:
   Complex(double real = 0.0, double imag = 0.0)   // inline constructor
   {
      realPart = real;
      imaginaryPart = imag;
   }
   void showComplexValues();                       // accessor prototype
   void assignNewValues(double real, double imag)  // inline mutator
   {
      realPart = real;
      imaginaryPart = imag;
   }
   bool operator==(const Complex&);
};   //end of class declaration
// implementation section
void Complex::showComplexValues()  // accessor
{
   char sign = '+';
   if (imaginaryPart < 0)
      sign = '-';
   cout << realPart << ' ' << sign << ' ' << abs(imaginaryPart) << 'i';
}
bool Complex::operator==(const Complex& complex2)
{
   if (realPart == complex2.realPart && imaginaryPart == complex2.imaginaryPart)
      return true;
   else
      return false;
   }
   int main()
   {
      Complex a(4, 2), b(6.5, 9.2), c(4, 2);  // declare three objects
      if (a == b)
         cout << "Complex number a and b are the same." << endl;
      else
         cout << "Complex numbers a and b are not the same." << endl;
         if (a == c)
            cout << "Complex numbers a and c are the same." << endl;
         else
            cout << "Complex numbers a and c are not the same." << endl;
            return 0;
}