2023年面向对象程序设计C++山师习题答案.doc

第七章习题答案
一、选择填空
1、D 2、A 3、B 4、C 5、A 6、C 7、B 8、D 9、
二、判断下列描述的对的性，对者划√，错者划×。
1、√ 2、× 3、× 4、× 5、√ 6、× 7、√ 8、√ 9、√ 10、×
11、√ 12、√ 13、× 14、√ 15、√ 16、× 17、√ 18、√
三、分析下列程序的输出结果。
1、
（1）上述结构的DAG图如下所示。

（2）无二义性
（3）无二义性
2、（1）无 （2无 （3）有 （4）无 （5）有
四、分析下列程序的输出结果
1、运营该程序输出如下结果。
（1，2）
5，6
（6，9）
2、该程序的输出结果如下所示
(1,2)
(6,9)
5,6
(6,9)
3、该程序的输出结果如下：
（13，22，30，40）
4、运营该程序输出结果如下所示。
D2::display()
pri1=4,pri2=5
pri4=6
pri12=7

D2::display()
pri1=12 ,pri2=9
pri4=7
pri12=8
5、该程序输出结果如下所示：
D2：：display()
pri1=1,pri2=4
pri4=6
pri12=7

D2::display()
pri1=9,pri2=8
pri4=7
pri12=8
6、该程序输出结果如下所示：
base class
base class
base class
derive1 class
derive2 class
五、按下列规定编写程序。
1、程序内容如下所示。
#include <iostream.h>
#include <iomanip.h>
class person
{
int no;
char name[10];
public:
void input()
{
cout<<" 编号：";cin>>no;
cout<<" 姓名：";cin>>name;
}
void disp()
{
cout<<" 编号："<<no<<endl;
cout<<" 姓名："<<name<<endl;
}
};
class student:public person
{
private:
char depart[6];
int degree;
public:
void input()
{
person::input();
cout<<" 班号："; cin>>depart;
cout<<" 成绩："; cin>>degree;
}
void disp()
{
person::disp();
cout<<" 班号："<<depart<<endl;
cout<<" 成绩："<<degree<<endl;
}
};
class teacher:public person
{
private:
char prof[10];
char depart[10];
public:
void input()
{
person::input();
cout<<" 职称："; cin>>prof;
cout<<" 部门："; cin>> depart ;
}
void disp()
{
person::disp();
cout<<" 职称："<< prof<<endl;
cout<<" 部门："<< depart <<endl;
}
};
void main()
{
student s1;
teacher t1;
cout<<"输入一个学生数据：\n"; s1.input();
cout<<"输入一个教师数据：\n"; t1.input();
cout<<"显示一个学生数据：\n"; s1.disp();
cout<<"显示一个教师数据：\n"; t1.disp();
}
2、程序内容如下所示。
#include <iostream.h>
#include <string.h>
class string
{
int length;
char *contents;
public:
int get_length(){return length;}
char *get_contents(){return contents;}
~string(){delete contents;}
int set_contents(int in_length,char *in_contents);
int set_contents(char *in_contents);
void print(){cout<<contents<<endl;}
};
class edit_string:public string
{
int cursor;
public:
int get_cursor_pos(){return cursor;}
void move_cursor(int how_much){cursor=how_much;}
int add_at_cursor(string *new_text);
int repl_at_cursor(string *new_text);
void dele_at_cursor(int how_much);
};
int string::set_contents(int in_length,char *in_contents)
{
length=in_length;
if (!contents) delete contents;
contents=new char[length+1];
strcpy(contents,in_contents);
return length;
}
int string::set_contents(char *in_contents)
{
length=strlen(in_contents);
if (!contents) delete contents;
contents=new char[length+1];
strcpy(contents,in_contents);
return length;
}
int edit_string::add_at_cursor(string *new_text)
{
int n,k,m;
char *cp,*pt;
n=new_text->get_length();
pt=new_text->get_contents();
cp=this->get_contents();
m=this->get_length();
char *news=new char[m+n+1];
for (int i=0;i<cursor;i++)
news[i]=cp[i];
k=i;
for (int j=0;j<n;i++,j++)
news[i]=pt[j];
cursor=i;
for(j=k;j<m;j++,i++)
news[i]=cp[j];
news[i]='\0';
set_contents(news);
delete news;
return cursor;
}
int edit_string::repl_at_cursor(string *new_text)
{
int n,m;
char *pt,*news;
n=new_text->get_length();
pt=new_text->get_contents();
m=this->get_length();
news=new char[m>n+cursor ? m+1 : n+cursor+1];
news=this->get_contents();
for(int i=cursor,j=0;i<n+cursor;j++,i++)
news[i]=pt[j];
if (m<n+cursor) news[i]='\0';
cursor=i;
set_contents(news);
delete news;
return cursor;
}
void edit_string::dele_at_cursor(int how_much)
{
int m;
char *cp,*news;
cp=this->get_contents();
m=this->get_length();
for(int i=cursor;i<m;i++)
cp[i]=cp[i+how_much];
cp[i]='\0';
}
void main()
{
string s1;
edit_string s2;
char *cp;
s1.set_contents("Object_Oriented Programming");
cp=s1.get_contents();
s2.set_contents(cp);
s2.print();
s2.move_cursor(15);
s1.set_contents("Windwos");
s2.add_at_cursor(&s1);
s2.print();
s2.move_cursor(6);
s2.dele_at_cursor(9);
s2.print();
s1.set_contents(" TTT");
s2.repl_at_cursor(&s1);
s2.print();
}
3、程序内容如下所示。
#include <iostream.h>
class vehicle
{
protected:
int wheels;
float weight;
public:
vehicle(int wheels,float weight);
int get_wheels();
float get_weight();
float wheel_load();
void print();
};
class car:vehicle
{
int passenger_load;
public:
car(int wheels,float weight,int passengers=4);
int get_passengers();
void print();
};
class truck:vehicle
{
int passenger_load;
float payload;
public:
truck(int wheels,float weight,int passengers=2,float max_load=240000.00);
int get_passengers();
float efficiency();
void print();
};
vehicle::vehicle(int wheels,float weight)
{
vehicle::wheels=wheels;
vehicle::weight=weight;
}
int vehicle::get_wheels()
{
return wheels;
}
float vehicle::get_weight()
{
return weight/wheels;
}
void vehicle::print()
{
cout<<" 车轮："<<wheels<<"个。"<<endl;
cout<<" 重量："<<wheels<<"公斤。"<<endl;
}
car::car(int wheels,float weight,int passengers):vehicle(wheels,weight)
{
passenger_load=passengers;
}
int car::get_passengers()
{
return passenger_load;
}
void car::print()
{
cout<<" 小车："<<endl;
vehicle::print();
cout<<" 载人："<<passenger_load<<"人。"<<endl;
cout<<endl;
}
truck::truck(int wheels,float weight,int passengers,float max_load):vehicle(wheels,weight)
{
passenger_load=passengers;
payload=max_load;
}
int truck::get_passengers()
{
return passenger_load;
}
float truck::efficiency()
{
return payload/(payload+weight);
}
void truck::print()
{
cout<<"卡车"<<endl;
vehicle::print();
cout<<" 载人："<<passenger_load<<"人。"<<endl;
cout<<" 效率："<<efficiency()<<endl;
cout<<endl;
}
void main()
{
car car1(4,1000,5);
truck tru1(10,5000,3,340000);
car1.print();
tru1.print();
}
4、程序内容如下所示。
#include <iostream.h>
#include <string.h>
class employee
{
protected:
int no;
char name[10];
float salary;
public:
employee()
{
cout<<"职工编号：";
cin>>no;
cout<<"职工姓名：";
cin>>name;
salary=0;
}
void pay(){}
void display(){}
};
class technician:public employee
{
private:
float hourlyrate;
int workhours;
public:
technician(){hourlyrate=100;}
void pay()
{
cout<<name<<"本月工作时数：";
cin>>workhours;
salary=hourlyrate*workhours;
}
void display()
{
cout<<"兼职技术人员："<<name<<"（编号为："<<no\
<<"）"<<"本月工资："<<salary<<endl;
}
};
class salesman:virtual public employee
{
protected:
float commrate;
float sales;
public:
salesman(){commrate=0.04;}
void pay()
{
cout<<name<<"本月销售额：";
cin>>sales;
salary=sales*commrate;
}
void display()
{
cout<<"销售员："<<name<<"（编号为："<<no<<"）"<<"本月工资："<<salary<<endl;
}
};
class manager:virtual public employee
{
protected:
float monthlypay;
public:
manager(){monthlypay=8000;}
void pay(){salary=monthlypay;}
void display()
{
cout<<"经理："<<name<<"（编号为："<<no<<"）"<<"本月工资："<<salary<<endl;
}
};
class salesmanager:public manager,public salesman
{
public:
salesmanager()
{
monthlypay=5000;
commrate=0.005;
}
void pay()
{
cout<<name<<"所管部门月销售量：";
cin>>sales;
salary=monthlypay+commrate*sales;
}
void display()
{
cout<<"销售经理："<<name<<"（编号为："<<no<<"）"<<"本月工资："<<salary<<endl;
}
};
void main()
{
manager m1;
technician t1;
salesman s1;
salesmanager sm1;
m1.pay();
m1.display();
t1.pay();
t1.display();
s1.pay();
s1.display();
sm1.pay();
sm1.display();
}