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必须重载运算符＆lt;＆lt;，lt =，operator ==和operator！=

.h文件和.cpp文件包含在下面：

namespace JoePitz
{
   class Complex
   {
      // declare friend functions
      friend ostream &operator<<(ostream &out, const Complex &value);
      friend ostream &operator<<(ostream &out, const bool &value);
      friend istream &operator>>(istream &in, Complex &value);

      public:
         // constructor
     Complex(double real, double imaginary);

      // overloading +/-/==/!= operators
      Complex operator+(const Complex &compx2);
      Complex operator-(const Complex &compx2);
      bool operator==(const Complex &compx2);
      bool operator!=(const Complex &compx2);

      private:
      double real;
      double imaginary;
      void initialize(double real, double imaginary);
   };

      // GCC requires friend functions to be declared in name space
      ostream &operator<<(ostream &out, const Complex &value);
      ostream &operator<<(ostream &out, const bool &value);
      istream &operator>>(istream &in, Complex &value);
}

   excerpt from .cpp file

   ostream& JoePitz::operator<<(ostream &out, const Complex &value)
   {
      // print real
      cout << value.real;

     // print imaginary
     if (value.imaginary == ISZERO)
     {
        cout << POSSIGN << value.imaginary << IMAGNSGN;
     }
     else if (value.imaginary > ISZERO)
     {
        cout << POSSIGN << value.imaginary << IMAGNSGN;
     }
     else
     {
        cout << value.imaginary << IMAGNSGN;
     }

     return out;

  }

  ostream& JoePitz::operator<<(ostream &out, const bool &value)
  {
     return out;
  }

  // overloaded == operator
  bool JoePitz::Complex::operator==(const Complex &compx2)
  {
     return (this->real == compx2.real && this->imaginary == compx2.imaginary);
  }

  // overloaded != operator
  bool JoePitz::Complex::operator!=(const Complex &compx2)
  {
     return !(this->real == compx2.real && this->imaginary == compx2.imaginary);
  }

我收到以下编译错误：

../ src / hw4.cpp：71：错误：不匹配＆＃39;运营商＆lt;＆lt;＆lt;＆＃39; in＆＃39; c1＆lt;＆lt; ＆＃34; * * * \ 012＆＃34;＆＃39; ../src/Complex.h:54：注意：候选人是：std :: ostream＆amp; JoePitz :: operator＆lt;＆lt;（std :: ostream＆amp;，const bool＆amp;） ../src/Complex.h:53：注意：std :: ostream＆amp; JoePitz :: operator＆lt;＆lt;（std :: ostream＆amp;，const JoePitz :: Complex＆amp;）

根据我的理解，这是因为不知道要实现哪个重载函数。

我遇到的问题是如何处理运营商＆lt;＆lt; function返回一个ostream并接受一个Complex对象，但是operator == function返回一个bool。

但我不知道如何更改operator ==函数来处理bool和/或Complex对象。我试图添加另一个重载的opperator＆lt;＆lt;返回bool的函数但编译器仍有问题。

非常感谢任何帮助。

Answer 1

这是一个简单的运算符优先级错误，这个

cout << "* * * Unit Test 3 comparison operations == != * * \n";
cout << " * * Print c1 == c1 = " << c1 == c1 << " * * *\n";

应该是这个

cout << "* * * Unit Test 3 comparison operations == != * * \n";
cout << " * * Print c1 == c1 = " << (c1 == c1) << " * * *\n";

<<的优先级高于==，因此您需要括号。

删除ostream bool重载。

另一个改变

  Complex operator+(const Complex &compx2);
  Complex operator-(const Complex &compx2);
  bool operator==(const Complex &compx2);
  bool operator!=(const Complex &compx2);

应该都是const方法

  Complex operator+(const Complex &compx2) const;
  Complex operator-(const Complex &compx2) const;
  bool operator==(const Complex &compx2) const;
  bool operator!=(const Complex &compx2) const;

重载运算符＆lt;＆lt; operator ==和operator！=

1 个答案: