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 0;
}
//（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 0;
}
//第三题目
#include <iostream>
using namespace std;
class A
 {
  public:
   A(){a=0;b=0;}
   A(int i){a=i;b=0;}
   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=0;}
   B(int i):A(i){c=0;}
   B(int i,int j):A(i,j){c=0;}
   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(1);
    B b3(1,3);
    B b4(1,3,5);
    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 0;
}
//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 0;
}
//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",50,'f',"prof.","president","135 Beijing Road,Shanghai","(021)61234567",1534.5);
  te_ca.show( );
  return 0;
}