操作員在一類超載，導致誤差範圍

Question

我試圖做一個類以超載+，-，*，/，<<，>>和==爲了對複數起作用。雖然試圖解決問題，我得到多個錯誤信息，說：

error: ‘double complexType::imaginaryPart’ is private 

我的頭文件是

#ifndef COMPLEXTYPE_H 
#define COMPLEXTYPE_H 
#include <iostream> 
#include <cmath> 
#include <fstream> 

class complexType 
    { 
    friend ostream& operator << (ostream &os, const complexType &a) 
    friend istream& operator >> (istream &is, const complexType &a) 
    public: 
    complexType(); 
    complexType(double real, double imag); 
    void getComplexType(double&, double&); 
    void setComplextType(const double&, const double&); 
    friend bool operator == (const complexType &otherComplex) const; 
    friend complexType operator + (const complexType &, const complexType &); 
    friend complexType operator - (const complexType &, const complexType &); 
    friend complexType operator * (const complexType &, const complexType &); 
    friend complexType operator/(const complexType &, const complexType &); 
    private: 
    double realPart; //Variable to store the real part 
    double imaginaryPart; //Variable to store the private part 
}; 
#endif // COMPLEXTYPE_H 

和我的執行文件是

#include "complexType.h" 

    complexType::complexType() 
    { 
    realPart = 0.0; 
    imaginaryPart = 0.0; 
    } 

    complexType::complexType(double r, double i) 
    { 
     realPart = r; 
     imaginaryPart = i; 
    } 

    void setComplextType(double r, double i) 
    { 
    realPart = r; 
    imaginaryPart = i; 
    } 

    bool operator == (const complexType &a, const complexType &b) 
    { 
    return (a.realPart == b.realPart && a.imaginaryPart == b.imaginaryPart); 
    } 

    operator + (const complexType &a, const complexType &b) 
    { 
    complexType temp; 
    temp.realPart = a.realPart + b.realPart; 
    temp.imaginaryPart = a.imaginaryPart + b.imaginaryPart; 
    return temp; 
    } 

    operator - (const complexType &a, const complexType &b) 
    { 
     complexType temp; 
     temp.realPart = a.realPart - b.realPart; 
     temp.imaginaryPart = a.imaginaryPart - b.imaginaryPart; 
     return temp; 
    } 

    operator * (const complexType &a, const complexType &b) 
    { 
     complexType temp; 
     temp.realPart = a.realPart * b.realPart - a.imaginaryPart * b.imaginaryPart; 
     temp.imaginaryPart = a.realPart * b.imaginaryPart + a.imaginaryPart *   b.realpart; 
     return temp; 
     } 


     operator/(const complexType &a, const complexType &b) 
     { 
     complexType temp; 
     temp.realPart = (a.realPart * b.realPart + a.imaginaryPart * b.imaginaryPart)/   (pow(b.realPart,2) + pow(b.imaginaryPart,2)); 
      temp.imaginaryPart = (-a.realPart * b.imaginaryPart +      a.imaginaryPart*b.realPart)/(pow(b.realPart,2) + pow(b.imaginaryPart,2)); 
     return temp; 
     } 

     ostream & operator << (ostream &os, const complexType &a) 
     { 
     os << "(" << a.realPart << " ," << a.imaginaryPart << "i)"; 
     return os; 
     } 

     istream & operator >> (istream &is, const complexType &a) 
     { 
     char ch, ch2, ch3; 
     is >> ch; 
     is >> a.realPart; 
     is >> ch2; 
     is >> a.imaginaryPart; 
     is >> ch3; 
     return is; 
     } 

我將不勝感激任何幫助，無論是與代碼和格式，因爲這是我的第一個問題。提前致謝。

Answer 1

您忘記將您的操作員定義作爲前綴類型的前綴（complexType）。所以返回類型默認爲int，並且與朋友聲明不匹配。

此外，您的setComplextType的定義沒有類前綴（complexType::）並且具有錯誤的參數類型，但不應導致您看到的錯誤消息。