*
*
1
C++ C++ G x
*
Gx
E
*
+
E
+
+
+
2
C++ B
*
B
3/H
*
+
*
H / 3
*
*
+
H/3
+
+*
%ye*
D
3
C++ G
*
G
class complex
// G u
{
public:
complex(double r=0.0,double i=0.0) // l
{ real=r; imag=i; }
void display(); // G u 8
private:
double real;
double imag;
};
4
C++ A X
*
AX
+
"~
+ - n ; ~ *
D
"~
l
+ -
5
C++ H
*
H
Dx
*
+
+
*
C++ r
{ |
*
+*
%ye*
D
C
D
|
D
@
@
6
C++ @ (
*
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+
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. .* :: ?:
C++ f
f
2
:
E r
2
*
D
2
D
f
bye2
D
7
C++ H
*
H
+
0
X D
*
8
C++ / 8
*
/8
/
+
/
{
operator 4 2
......
}
= 4
>
2 -1
= 4
++ --
2 4 2
9
C++ /
*
/
/
/
B
B r
+*
oprd1 B oprd2 C
B /
oprd2 /
A t }
+*
oprd1 C A /
*
D
*
oprd1 B oprd2 C
oprd1.operator B(oprd2)
10
C++
*
8.1
l + l -
l
l
:
l
:
8
D
11
#include<iostream>
using namespace std;
class complex // D r
{
public:
//
complex(double r=0.0,double i=0.0){real=r;imag=i;}
//
complex operator + (complex c2); //+ D r 2
complex operator - (complex c2); //- D r 2
void display(); //
private:
// D r 2
double real;
//
double imag; //
};
12
complex complex::
operator +(complex c2) // : - c 2
{
complex c;
c.real=c2.real+real;
c.imag=c2.imag+imag;
return complex(c.real,c.imag);
}
13
complex complex::
operator -(complex c2) // : - c 2
{
complex c;
c.real=real-c2.real;
c.imag=imag-c2.imag;
return complex(c.real,c.imag);
}
14
void complex::display()
{ cout<<"("<<real<<","<<imag<<")"<<endl; }
void main() //
{ complex c1(5,4),c2(2,10),c3; // : - c 2
cout<<"c1="; c1.display();
cout<<"c2="; c2.display();
c3=c1-c2;
// : 6 ~ 2
D
cout<<"c3=c1-c2=";
c3.display();
c3=c1+c2;
// : 6 ~ 2
D
cout<<"c3=c1+c2=";
c3.display();
}
15
c1=(5,4)
c2=(2,10)
c3=c1-c2=(3,-6)
c3=c1+c2=(7,14)
16
C++ H
*
H
#
h H
U
*
h H
U #
C U oprd C
hH )
A
}*
D
oprd C A h H )
U
-}
hH )
C
U oprd C
oprd.operator U()
17
C++ I 8
*
I8
@
+
*
++ --
n ++ C -*
{C
oprd++ C oprd-- C
oprd
C A {C v
++ C -- { C v A C
* int { C v
oprd++ { C v
oprd.operator ++(0)
18
C++ / H
*
/H
+ 8.2
4
++ l
l
p
p v *
%ye*
+*
a~
4 *
++
1l
19
//8_2.cpp
#include<iostream>
using namespace std;
class Clock // G d
{
public:
// l
Clock(int NewH=0, int NewM=0, int NewS=0);
void ShowTime();
Clock& operator ++(); //
Clock operator ++(int); //
private: // G d 8
int Hour,Minute,Second;
};
20
Clock& Clock::operator ++() //
{ Second++;
if(Second>=60)
{ Second=Second-60;
Minute++;
if(Minute>=60)
{
Minute=Minute-60;
Hour++;
Hour=Hour%24;
}
}
return *this;
}
d~
21
//
Clock Clock::operator ++(int)
{
//
H~
Clock old=*this;
++(*this);
return old;
}
22
//
T
void main()
{
Clock myClock(23,59,59);
cout<<"First time output:";
myClock.ShowTime();
cout<<"Show myClock++:";
(myClock++).ShowTime();
cout<<"Show ++myClock:";
(++myClock).ShowTime();
}
23
First time output: 23:59:59
Show myClock++: 23:59:59
Show ++myClock: 0:0:1
24
C++ N
*
N
P
%ye*
%ye*
XO
*
+
X O
XO
%ye*
*
*
++ -int
P
P
25
C++ O H
*
OH
Pv
B
oprd1 B oprd2
operator B(oprd1,oprd2 )
: #
2 B
B oprd
operator B(oprd )
: #
2 ++ --
oprd B(oprd,0 B
operator )
26
C++ J
*
J
+ 8-3
+l - | }
|}
*
*
D
D
27
#include<iostream>
using namespace std;
class complex // m
{
public:
//
complex(double r=0.0,double i=0.0)
{ real=r; imag=i; }
//
friend complex operator + (complex c1,complex c2);
//
+ m 2
friend complex operator - (complex c1,complex c2);
//
- m 2
void display(); // m 2
private:
// m 2
double real;
double imag;
};
28
complex operator +(complex c1,complex c2)
//
: s}
{
return
complex(c2.real+c1.real, c2.imag+c1.imag);
}
complex operator -(complex c1,complex c2)
//
: s}
{ return
complex(c1.real-c2.real, c1.imag-c2.imag);
}
//
8.1 : s
29
C++ 8
*
8
x
+
#~
*
%ye*
D
x#
*
%ye*
%ye*
+
*
30
#include<iostream>
X _ b
using namespace std;
class Point
{ public:
Point(double i, double j) {x=i; y=j;}
double Area() const{ return 0.0;}
private:
double x, y;
};
class Rectangle:public Point
{ public:
Rectangle(double i, double j, double k, double l);
double Area() const {return w*h;}
private:
double w,h;
};
31
Rectangle::Rectangle(double i, double j, double
k, double l) :Point(i,j)
{ w=k; h=l; }
void fun(Point &s)
{ cout<<"Area="<<s.Area()<<endl; }
void main()
{
Rectangle rec(3.0, 5.2, 15.0, 25.0);
fun(rec);
}
D =
Area=0
32
#include<iostream>
M =
using namespace std;
class Point
{ public:
Point(double i, double j) {x=i; y=j;}
virtual double Area() const{ return 0.0;}
private:
double x, y;
};
class Rectangle:public Point
{ public:
Rectangle(double i, double j, double k, double l);
virtual double Area() const {return w*h;}
private:
double w,h;
};
// M = 2
8.8
33
void fun(Point &s)
{ cout<<"Area="<<s.Area()<<endl; }
void main()
{
Rectangle rec(3.0, 5.2, 15.0, 25.0);
fun(rec);
}
:
Area=375
34
C++
*
X
X
*
virtual :
{X 2
{ X
2
: v 2
D
virtual
by e 2
D
D
D
h v 2
:
@
:
:X
35
C++
*
8.4
#include <iostream>
using namespace std;
class B0
// l
B0 l
{public:
// l
virtual void display() // T .
{cout<<"B0::display()"<<endl;}
};
class B1: public B0 // l
{ public:
void display() { cout<<"B1::display()"<<endl; }
};
class D1: public B1 // l
{ public:
void display() { cout<<"D1::display()"<<endl; }
};
36
void fun(B0 *ptr) // l
{ ptr->display(); }
void main() // l
{ B0 b0, *p;
B1 b1; // ]
D1 d1; // ]
p=&b0;
fun(p); // l
p=&b1;
fun(p); // ]
p=&d1;
fun(p); // ]
}
//
8 8
8 8
T
B0 l
8
B1 l
8
D1 l
]8
B0::display()
B1::display()
D1::display()
37
C++ (
*
(
1
+
*
:
:
*
+
%ye
delete
by e
by e
*
*
2
2
38
C++
*
+
Pf~
*
class
D
:
*
(C
{
virtual x
)=0;
//
...
}
39
C++ h
*
h
+
+
@
D
%ye*
@
D
+
+
d~
*
D
d~
%ye*
40
C++ x
*
x
8.5
#include <iostream>
using namespace std;
class B0
// l
B0 l
{ public:
// l
virtual void display( )=0; // , 8
};
class B1: public B0 // l
{ public:
void display(){cout<<"B1::display()"<<endl;} // ,
};
class D1: public B1 // l
{ public:
void display(){cout<<"D1::display()"<<endl;} // ,
};
41
void fun(B0 *ptr) // l
{ ptr->display(); }
void main() // l
{ B0 *p; // T
B1 b1; // T
D1 d1; // T
p=&b1;
fun(p); // T
p=&d1;
fun(p); // T
}
> 8
> 8
> 8
>
B1 l
>
D1 l
T >
B1::display()
D1::display()
42