第13章
//*******
//*13.1**
//*******
物质->有机物、无机物
有机物->生物、非生物
生物->植物、动物
动物->低级动物、高级动物
高级动物->人、其他高级动物
//*****************
//******13.2未完成*
//*****************
# include <iostream.h>
class Student
{
public:
void setname(char * newname);
char * getname();
protected:
char * name;
int numofcourse;//实际选修课程数
};
class Course
{
public:
void setxuefen(float x);
float getxuefen();
protected:
char * kecheng;
float xuefen;
int numofstuent;//实际选修人数
};
void main()
{
}
第14章
//*****************
//******14.1*******
//*****************
//Multi[0] is:0
//Multi[0] is:1
//Multi[0] is:4
//Multi[0] is:9
//Multi[0] is:16
//Multi[0] is:25
//Multi[0] is:36
//Multi[0] is:49
//Multi[0] is:64
//Multi[0] is:81
//Destroying..9
//Destroying..8
//Destroying..7
//Destroying..6
//Destroying..5
//Destroying..4
//Destroying..3
//Destroying..2
//Destroying..1
//Destroying..0
//*****************
//******14.2*******
//*****************
1
2
3
4
5
6
7
8
9
10
Null pointer assignment
增加的拷贝构造函数为：
Vector::Vector(Vector & x)
{
size=x.size;
int * buffer=new int[x.size];
for(int k=0;k<x.size;k++)
{
buffer[k]=x.buffer[k];
}
};
//*****************
//******14.3*******
//*****************
# include <iostream.h>
class X
{
public:
X(int a)
{
cout<<"construct a class:"<<a<<endl;
i=a;
};
X(X& b)
{
cout<<"copy a class of:"<<b.i<<endl;
};
~X()
{
cout<<"distroy a class:"<<i<<endl;
};
protected:
int i;
};
X f(X b)
{
cout<<" come in f()"<<endl;
cout<<" come out f()"<<endl;
return b;
};
void main()
{
X a(1);//construct a class:1
cout<<" "<<endl;
X b=f(X(2));//construct a class:2
//come in f()
//come out f()
//copy a class of:2
//distroy a class临时class
cout<<" "<<endl;
a=f(a);
//copy a class of:1
//come in f()
//come out f()
//copy a class of:1
//distroy a class临时class
//distroy a class: ???
cout<<" "<<endl;
}
//distroy a class 2
//distroy a class 1
//*****************
//******14.4*******
//*****************
CAT::CAT(const CAT & A)
{
int * itsAge=new int;
* itsAge=A.itsAge;
}
第15章
//*****************
//******15.1(1)****
//*****************
class example
{
public:
example(int);
~example();
protected:
int i;
static int j;
};
static int j=0;
example::example(int a)
{
j=a;
j++;
};
example::~example()
{
j--;
};
//*****************
//******15.1(2)****
//*****************
# include <iostream.h>
class example
{
public:
example(int);
~example();
void getij()
{
cout<<"i:"<<i<<" "<<"j:"<<j<<endl;
};
protected:
int i;
static int j;
};
int example::j=0;//注意:非static int example::j=0;
example::example(int a)
{
i=a;
j++;
cout<<"construct a class: "<<j<<endl;
};
example::~example()
{
j--;
cout<<"distroy a class "<<"and j="<<j<<endl;
};
void main()
{
example x(1);
x.getij();
cout<<endl;
example y(2);
y.getij();
cout<<endl;
example z(3);
z.getij();
cout<<endl;
x.getij();
y.getij();
z.getij();
cout<<endl;
}
//*****************
//******15.1(3)****
//*****************
# include <iostream.h>
class example
{
public:
example(int);
~example();
void getij()
{
cout<<"i:"<<i<<" "<<"j:"<<j<<endl;
};
static void getj()
{
cout<<"j:"<<j<<endl;
};
protected:
int i;
static int j;
};
int example::j=0;//注意:非static int example::j=0;
example::example(int a)
{
i=a;
j++;
cout<<"construct a class: "<<j<<endl;
};
example::~example()
{
j--;
cout<<"distroy a class "<<"and j="<<j<<endl;
};
void main()
{
example x(1);
x.getij();
cout<<endl;
example y(2);
y.getij();
cout<<endl;
example z(3);
z.getij();
cout<<endl;
x.getj();
cout<<endl;
y.getj();
cout<<endl;
z.getj();
cout<<endl;
x.getij();
y.getij();
z.getij();
cout<<endl;
}
//******15.2(1)****
//*****************
void SetValue(Animal&,int,int);不是class Animal的友元，不能直接访问其保护数据成员。
应修改void SetValue(Animal&,int,int)为class Animal的友元。
//*****************
//******15.2(2)****
//*****************
类的成员函数定义为：
void Animal::SetWeight(int tw)
{
itsWeight=tw;
};
void Animal::SetAge(int tn)
{
itsAge=tn;
};
普通函数定义为：
void SetValue(Animal& ta,int tw)
{
ta.Weight(tw);
};
void SetValue(Animal& ta,int tw,int tn)
{
ta.Weight(tw);
ta.SetAge(tn);
};
//*****************
//******15.3*******
//*****************
# include <iostream.h>
# include <math.h>
class Boat;
class Car
{
public:
Car(int j){size=j;}
int get(){return size;}
int Leisure(int time)
{
return int(sqrt(time))*size;
}
protected:
int size;
};
class Boat
{
public:
Boat(int j){size=j;}
int get(){return size;}
int Leisure(int time)
{
return int(sqrt(time))*size;
}
protected:
int size;
};
void main()
{
Car c1(2);
Boat b1(3);
int time=4;
cout<<c1.Leisure(time)*b1.Leisure(time);
}