21次C++作业

 //第一题目
 class A                   //A为基类
 {public:
   void f1( );
   int i;
  protected:
   void f2();
   int j;
  private:
   int k;
 };
 /*f4里面是可以调用的
 C的对象不能直接调用f2()的成员函数里
 f2()也是类C的protected 函数在C++中派生类的成员函数是可以直接访问基类的保护成员和公有成员。
 */
 class B: public A            //B为A的公用派生类
 {public:
   void f3( );
  protected:
   int m;
  private:
   int n;
 };

 class C: public B              //C为B的公用派生类
 {public:
   void f4();
  private:
   int p;
 };

 int main()
 {A a1;                         //a1是基类A的对象
  B b1;                         //b1是派生类B的对象
  C c1;                         //c1是派生类C的对象
  return ;
 }
 //（1）b1.i,b1.j可以，b1.k不可以
 //(2)可以
 //(3)i,j可以，k不可以
 //(4)i,j,m,p可以，k,n,p不可以
 //(5)可以
 //(6)可以
 //第二题目
 #include <iostream>
 using namespace std;
 class A
 {public:
   void f1( );
  protected:
   void f2();
  private:
   int i;
 };

 class B: public A
 {public:
   void f3( );
   int k;
  private:
   int m;
 };

 class C: protected B
 {public:
   void f4();
  protected:
   int n;
  private:
   int p;
 };

 class D: private C
 {public:
   void f5();
  protected:
   int q;
  private:
   int r;
 };

 int main()
 {A a1;
  B b1;
  C c1;
  D d1;
  return ;
 }
 //第三题目
 #include <iostream>
 using namespace std;
 class A
  {
   public:
    A(){a=;b=;}
    A(int i){a=i;b=;}
    A(int i,int j){a=i;b=j;}
    void display(){cout<<"a="<<a<<" b="<<b;}
   private:
    int a;
    int b;
  };

 class B  : public A
  {
   public:
    B(){c=;}
    B(int i):A(i){c=;}
    B(int i,int j):A(i,j){c=;}
    B(int i,int j,int k):A(i,j){c=k;}
    void display1()
     {display();
      cout<<" c="<<c<<endl;
     }
    private:
     int c;
 };

 int main()
 {   B b1;
     B b2();
     B b3(,);
     B b4(,,);
     b1.display1();//a=0,b=0,c=0
     b2.display1();//a=1,b=0,c=0
     b3.display1();//a=1,b=3,c=0
     b4.display1();//a=1,b=3,c=5
     return ;
 }
 //第四题目
 #include <iostream>
 using namespace std;
 class A
  {
   public:
    A(){cout<<"constructing A "<<endl;}
    ~A(){cout<<"destructing A "<<endl;}
  };

 class B  : public A
  {
   public:
    B(){cout<<"constructing B "<<endl;}
    ~B(){cout<<"destructing B "<<endl;}
 };

 class C  : public B
  {
   public:
    C(){cout<<"constructing C "<<endl;}
    ~C(){cout<<"destructing C "<<endl;}
 };
 int main()
 { C c1;
   return ;
 }
 //a(),b(),c(),~c(),~b(),~a()构造从基类开始，析构顺序相反
 //第五题目
 #include<string>
 #include <iostream>
 using namespace std;
 class Teacher
  {public:
    Teacher(string nam,int a,char s,string tit,string ad,string t);
    void display();
   protected:
     string name;
     int age;
     char sex;
     string title;
     string addr;
     string tel;
 };

 Teacher::Teacher(string nam,int a,char s,string tit,string ad,string t):
      name(nam),age(a),sex(s),title(tit),addr(ad),tel(t){ }
 void Teacher::display()
      {cout<<"name:"<<name<<endl;
       cout<<"age"<<age<<endl;
       cout<<"sex:"<<sex<<endl;
       cout<<"title:"<<title<<endl;
       cout<<"address:"<<addr<<endl;
       cout<<"tel:"<<tel<<endl;
       }

 class Cadre
  {public:
    Cadre(string nam,int a,char s,string p,string ad,string t);
    void display();
   protected:
    string name;
    int age;
    char sex;
    string post;
    string addr;
    string tel;
  };

 Cadre::Cadre(string nam,int a,char s,string p,string ad,string t):
      name(nam),age(a),sex(s),post(p),addr(ad),tel(t){}

 void Cadre::display()
     {cout<<"name:"<<name<<endl;
      cout<<"age:"<<age<<endl;
      cout<<"sex:"<<sex<<endl;
      cout<<"post:"<<post<<endl;
      cout<<"address:"<<addr<<endl;
      cout<<"tel:"<<tel<<endl;
     }

 class Teacher_Cadre:public Teacher,public Cadre
  {public:
    Teacher_Cadre(string nam,int a,char s,string tit,string p,string ad,string t,float w);
    void show( );
   private:
     float wage;
  };

 Teacher_Cadre::Teacher_Cadre(string nam,int a,char s,string t,string p,string ad,string tel,float w):
   Teacher(nam,a,s,t,ad,tel),Cadre(nam,a,s,p,ad,tel),wage(w) {}
 void Teacher_Cadre::show( )
     {Teacher::display();//调用teacher的display函数输出
      cout<<"post:"<<Cadre::post<<endl;
      cout<<"wages:"<<wage<<endl;
      }

 int main( )
  {Teacher_Cadre te_ca("Wang-li",,'f',"prof.","president","135 Beijing Road,Shanghai","(021)61234567",1534.5);
   te_ca.show( );
   return ;
 }