在子类成员函数Pin中调用基类memeber函数 [英] Calling base class memeber function in child class member function Pin

问题描述

嗨eveeryone，

有人可以看看我的代码并教我错误的地方。

Hi eveeryone,
Can someone please look at my code and teach me where i am making mistake.

 void Laptop::show()
{	Computer::show();
	cout<<"weight is="<<weight<<endl;
	cout<<"height is ="<<height<<endl;
	cout<<"length is ="<<length<<endl;
	cout<<"width is ="<<width<<endl;	
	
 
}

在这个函数中，Laptop :: show是一个子类函数，它调用Computer :: show（）;基类function.but编译器使用错误.or - >函数Computer :: show（）;未被调用。

原始代码如下：

In this function Laptop::show is a child class fucntion which is calling Computer::show(); a base class function.but compiler gives error to use .or -> so function Computer::show(); is not called.
Orignal code is given below:

#include<iostream.h>
#include<conio.h>
class Computer
{
protected:
int wordSize;
int memorySize;
int storageSize;
int speed;
public:	
Computer(){}
Computer(int,int,int,int);
void show();
};
class Laptop
{
	private:
int	width;
int	height;
int	length;
int	weight;

public:	
Laptop(){}
Laptop(int,int,int,int,int,int,int,int);
void show();
};
Computer::Computer(int wdSize, int memSize, int storSize ,int spee)
{
	wordSize=wdSize;
	memorySize=memSize;
	storageSize=storSize;
	speed=spee;
}
void Computer::show()
{
	cout<<"Word Size :"<<wordSize<<endl;
	cout<<"Memory Size: "<<memorySize<<endl;
	cout<<"Storage Size"<<storageSize<<endl;
	cout<<"Speed :"<<speed;
}
Laptop::Laptop(int wdSize, int memSize,int storSize, int spee,int wid, int hei , int len , int wait ):Computer(wdSize,memSize,storSize,spee);

	{
		
	width=wid;
	length=len;
	height=hei;
	weight=wait;	
} 
void Laptop::show()
{	Computer::show();
	cout<<"weight is="<<weight<<endl;
	cout<<"height is ="<<height<<endl;
	cout<<"length is ="<<length<<endl;
	cout<<"width is ="<<width<<endl;	
	

}
void main()
{
	clrscr();
	Computer comp(4,512,20,2);
	Laptop lap(8,1024,50,2,15,19,14,2);
	cout<<"Computer Specifications are"<<endl;
	comp.show();
	cout<<":Laptop specifications are"<<endl;
	lap.show();
	getch();
}	

推荐答案

确定改变这些行：

OK change these lines:

#include <iostream>

// Inherit Laptop from Computer
class Laptop: public Computer

//Remove semicolon
Laptop::Laptop(int wdSize, int memSize,int storSize, int spee,int wid, int hei , int len , int wait ):Computer(wdSize,memSize,storSize,spee)

// Not needed
//	clrscr();

现在编译程序。

Now compile the program.

你的笔记本电脑类不是从计算机<派生的/ code> class因为您错过了派生类定义中的基类声明。它应该是：



Your Laptop class is not derived from the Computer class because you missed the base class declaration in the derived class definition. It should be:

class Laptop : public Computer
{
// ...
};

谢谢你们......那是我想念的东西。感谢你们的宝贵时间。

@pwasser和@Jochen Arndt

Thank You guys... That was the thing i missing.Thank You soo much for your precious time
@pwasser and @Jochen Arndt

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