调试继承类 [英] Debugging Inheritance Class

问题描述

在运行代码时，我收到以下错误，似乎我已尽一切努力消除了这些错误，但似乎没有任何效果。 任何建议或对我可能做错事的解释将不胜感激。以下是错误：
在我的 class Integer：public Number代码中，它表示 ！！期望的类名
和位于 Integer（const Double& d）；它说：！未知类型名称'Double'；您是说'double'吗？

I am receiving the following errors when running my code and it seems as if I had tried everything to eliminate them but nothing is appearing to work. Any suggestions or explanation of what I be may doing wrong would be greatly appreciated. Here are the errors: In my code at "class Integer : public Number" it says "! Expected class name" and at "Integer(const Double &d);" it says "! Unknown type name 'Double'; did you mean 'double'?"

以下可能是 Integer.h 中的实际代码其中包含以下错误：

Here is may actual code in Integer.h which contains the errors:

#ifndef INTEGER
#define INTEGER

#include "Number.h"
#include "Double.h"

namespace MyNamespace {

using std::string;

class Double;

class Integer : public Number

{

private:

    void create(int i);

    bool NaN(string s, int iCount);

    bool nan;

public:

    //Constructors

    Integer();

    Integer(int i);

    Integer(const Integer &i);

    Integer(const Double &d);  //ERROR HERE = "Unknown type 'Double'"

    Integer(string s);


    void equals(int i);

    void equals(string s);

    Integer add(const Integer &i);

    Integer sub(const Integer &i);

    Integer mul(const Integer &i);

    Integer div(const Integer &i);

    Integer add(int i);

    Integer sub(int i);

    Integer mul(int i);

    Integer div(int i);

    int toInt() const;


    //Print
    void printInteger();


    // operator overloads

    Integer operator + (const Integer &i);

    Integer operator - (const Integer &i);

    Integer operator * (const Integer &i);

    Integer operator / (const Integer &i);

    Integer operator = (const Integer &i);

    Integer operator = (int i);

    Integer operator = (string s);

    string toString() const;

    bool operator == (const Integer &i);

    bool operator == (int i);

    bool operator != (const Integer &i);

    bool operator != (int i);


    bool isNan();

};
}

#endif

Number.h

#ifndef NUMBER
#define NUMBER

#include <iostream>
#include <string>

namespace MyNamespace {

using std::string;

class Number : public string
{

public:

    Number();

    Number(string s);


};

}

#endif

Double.h

#ifndef DOUBLE
#define DOUBLE

#include "Number.h"
#include "Integer.h"

namespace MyNamespace
{

class Integer;    

class Double : public Number

{

private:

    void create(double d);

    bool NaN(string s, int dCount);

    bool nan;

public:

    // Constructors

    Double();

    Double(double d);

    Double(const Double &d);

    Double(const Integer &i);  //ERROR HERE = "Unknown type 'Integer'"

    Double(string s);


    void equals(double d);

    void equals(string s);

    Double add(const Double &d);

    Double sub(const Double &d);

    Double mul(const Double &d);

    Double div(const Double &d);

    Double add(double d);

    Double sub(double d);

    Double mul(double d);

    Double div(double d);

    double toDouble() const;

    //Print
    void printDouble();

    // operator overloads

    Double operator + (const Double &d);

    Double operator - (const Double &d);

    Double operator * (const Double &d);

    Double operator / (const Double &d);

    Double operator = (const Double &d);

    Double operator = (double d);

    Double operator = (string s);

    string toString() const;

    bool operator == (const Double &d);

    bool operator == (double d);

    bool operator != (const Double &d);

    bool operator != (double d);


    bool isNan();

};
}

#endif

推荐答案

简化Number.h。不要在其中包含 Integer.h和 Double.h。您甚至都没有引用此文件中的那些文件。

Simplify Number.h. Don't include "Integer.h" and "Double.h" in it. You are not even referencing anything from those files in this file.

#ifndef NUMBER  // I'd recommend using NUMBER_H instead of just NUMBER
#define NUMBER

#include <iostream>
#include <string>

using std::string;

namespace MyNamespace {

class Number : public string
{
public:

    Number();

    Number(string s);

};

}

#endif

删除< Double.h的code> #include Integer.h 。同样，从Integer.h中删除 #include Double.h 。在Double.h中添加 Integer 的前向声明，并在Integer.h中添加 Double 的前向声明。

Remove #include "Integer.h" from Double.h. Similarly, remove #include "Double.h" from Integer.h. Add a forward declaration of Integer in Double.h and a forward declaration of Double in Integer.h.

#ifndef DOUBLE
#define DOUBLE

#include "Number.h"

namespace MyNamespace
{
   class Integer;

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