#include<iostream.h>
class A
{
protected:
   int a;
pudlic:
   void SetData(int x){a=x;}
   int GetData() {return a;}
};
classs B
{
protected:
    int b;
public:
    void setData(int y){a=y;}
    int GetData() {return b;}
};
class C : public A, public B
{
public:
    void setData(int x,int y){ a=x; b=y; }
};
void main()
{
    C c;
    c.setData(30,70);
    cout<<"a="<<c.GetData()<<",b="<<c.GetData()<<endl;
}

除开语法错误.这个程序最在的问题在于,多重类的函数调用不明确.
    C c;
    c.setData(30,70);
    cout<<"a="<<c.GetData()<<",b="<<c.GetData()<<endl;
c现在不知道是调用A类的还是应该调用B类的

#include <iostream>
using namespace std;

class A
{
protected:
   int a;
public:
   void SetData(int x){a=x;}
   int GetData() {return a;}
};
class B
{
protected:
    int b;
public:
    void setData(int y){b=y;}
    int GetData() {return b;}
};
class C : public A, public B
{
public:
    void setData(int x,int y){ a=x; b=y; }
};
void main()
{
    C * c = new C;
    c->setData(30,70);
    cout<<"a="<<static_cast<A*>(c)->GetData()<<",b="<<static_cast<B*>(c)->GetData()<<endl;
    delete c;
}

谢谢!我没学C++不是很懂,,,,朋友问我的
谢谢2楼的朋友!

以下程序有什么错误?如有请给予修改.
(1)使用静态成员函数.
#include<iostream.h>
#include<string.h>
classpeson{
public:
   char m_strName[20];
   long m_ID;
public:
   person(char*strName,long ID){strcpy(m_strName);m_ID=ID;}
   static long GetID() {return m_ID;}
};
void main ()
{
  person personl ("LiuJun",1101640524);
cout<<"ID="<person::GetID()<<'\n';
}
(2)派生类的构造函数调用基类的构造函数。
#include<iostream.h>
class point
{
protected:
   int x,y;
public:
   point(int a ,int b){a=x;y=b;}
   int getX(){return x;}
   int getY(){return y;}
};
 class Cirrcle :public point
{
protected
   int radius;
public:
   Circle(int a=0,int b=0,int r=o){redius=r;}
   int getRadius() {return redius;}
};
vodi main()
{
   Circle c(100,150,200)
  cout<<"x="<<c.getX()<<",y="<<c.getY()<<", radius="<<c.get Radius()<<endl;
}
(3)关于常对象和常对象成员。
#include<iostream.h>
class Sample
{
private：
   int n；
public:
   Aample（int x）{n=x；}
   void SetValue（int x）{n=x；}
   void Display（）{cout<<"n="<<end1;}
};
void main()
{
   const Sample a(100);
   a.SetValue(0);
   a.Display();
}

又看了下.应该这样改才最好的
#include <iostream>
using namespace std;

class A
{
protected:
   int a;
public:
   void SetData(int x){a=x;}
   int GetData() {return a;}
};
class B
{
protected:
    int b;
public:
    void setData(int y){b=y;}
    int GetData() {return b;}
};
class C : public A, public B
{
public:
    void setData(int x,int y){ a=x; b=y; }
};
void main()
{
    C c;
    c.setData(30,70);
    cout<<"a="<<static_cast<A>(c).GetData()<<",b="<<static_cast<B>(c).GetData()<<endl;
}

(1)使用静态成员函数.改好(我现在正无聊)
#include <iostream>
using namespace std;
#include<string.h>
class person{
public:
   char m_strName[20];
   static long m_ID;
public:
   person(char*strName,long ID){strcpy(m_strName, strName);m_ID=ID;}
   static long GetID() {return m_ID;}
};
long person::m_ID;
void main ()
{
  person personl ("LiuJun",1101640524);
cout<<"ID="<<person::GetID()<<'\n';
}

(2)派生类的构造函数调用基类的构造函数。
#include <iostream>
using namespace std;
class point
{
protected:
   int x,y;
public:
   point(int a ,int b){x=a;y=b;}
   int getX(){return x;}
   int getY(){return y;}
};
class Circle :public point
{
protected:
   int radius;
public:
    Circle(int a=0,int b=0,int r=0) : point(a, b) {radius=r;}
   int getRadius() {return radius;}
};
void main()
{
   Circle c(100,150,200);
  cout<<"x="<<static_cast<point>(c).getX()<<",y="<<static_cast<point>(c).getY()<<", radius="<<c.getRadius()<<endl;
}

(3)关于常对象和常对象成员。
#include <iostream>
using namespace std;
class Sample
{
private:
   int n;
public:
   Sample(int x){n=x;}
   void SetValue(int x){n=x;}
   void Display(){cout<<"n="<<n<<endl;}
};
void main()
{
   const Sample * a = new Sample(100);
   const_cast<Sample*>(a)->SetValue(0);
   const_cast<Sample*>(a)->Display();
   delete a;
}

这C与C++完全不一样...
语法都不同的...哎

我是一个无聊的人

朋友...干脆你留个QQ,我让他直接请教你好吗?