Question

我正在创建课程，这样我就能更好地理解它们。当我创建一个类应该使用什么头文件和cpp？

Answer 1

头文件用于类定义和实现的cpp文件。像这样：

<强> Test.h

class Test
{
public:

  void PrintHelloWorld(void);
};

<强> Test.cpp的

void Test::PrintHelloWorld(void)
{
   cout << "Hej på dig världen!";
}

Answer 2

这是一个非常基本的问题。您可能应该找到一本C ++教程或书籍来帮助您。

头文件具有类定义。

cpp文件具有类实现。

Answer 3

头文件应该包含“#include”指令，常量定义和类方法的定义：构造函数，析构函数和方法。想想它就像定义类的接口一样。

Cpp应该包含实现。所以在cpp中你意识到你在.h文件中声明的所有内容。

以下是一个例子：

CBug.h：

#ifndef CBUG_H
#define CBUG_H

#include <string>
#include <vector>

using namespace std;

enum BugState
{
     ILLEGAL = -1,
     ACTIVE = 0,
     RESOLVED,
     CLOSED     
};

/**
 * CBug - class to describe the record about any bug
 */
class CBug
{
    private:
        string DevName;
        string Project;
        int Id;
        string ErrorDesc;
        BugState State;
        // class constructor
        CBug();


    public:

    // class destructor
    ~CBug();

    /**
     * CreateBug
     * creates a new bug, reads values from string and returns a pointer to a bug
     * @param Params contains all necessary information about bug
     * @return pointer to a newly created bug
     */
    static CBug * CreateBug ( string Params ); 
        // setters
        void SetState( BugState );

        //getters
        string GetDeveloper( );
        int GetId();
        int GetState( );
        bool IsActive( );
        string ToString( );
};

#endif // CBUG_H

CBug.cpp：

// Class automatically generated by Dev-C++ New Class wizard

#include "CBug.h" // class's header file
#include "CUtil.h"

#include <iostream>
#include <sstream>

// class constructor
CBug::CBug()
{

}

// class destructor
CBug::~CBug()
{

}

CBug * CBug::CreateBug ( string Params )
{
 #if 1     
     cout << "Param string:" << Params << endl;
 #endif
     if( Params.length() == 0 ) {
         return NULL;       
     }

     CBug * Bug = new CBug(); 

     if ( Bug != NULL )
     {
       vector<string> s(5); 
       s = CUtil::StringSplit ( Params, " " ); // разбиваем строку с параметрами на отдельные строки
       cout << s[0] << endl;

       Bug->DevName = s[0];
       Bug->Project = s[1];
       Bug->ErrorDesc = s[3];
       sscanf( s[2].c_str(), "%d", &(Bug->Id) );
       cout << "id: " << Bug->Id << endl;
       Bug->State = ACTIVE;
      }

     return Bug;  
}

string CBug::GetDeveloper()
{
     return DevName;
}

int CBug::GetState()
{
     return State;
}

int CBug::GetId()
{
     return Id;
}

void CBug::SetState ( BugState state )
{
     State = state;
}

bool CBug::IsActive()
{
     return ( State!=CLOSED );
}

string CBug::ToString() // для вывода пользователя
{
      ostringstream   out;
      out << "Id: " << Id << " DevName: " << DevName << " Project: " << Project << " Desc: " << ErrorDesc << " State: " << State;
      return(out.str());
}

c ++使用headers和cpp文件创建类

3 个答案: