-. :
static _ _ ().
.
- . , . , this.
- . . :
_:: _ ( );
1 _ .
# include <stdio. h >
class A
{
public:
static void stat_func ()
{
puts ( !);
}
};
void main ()
{
A:: static_func (); // .
}
2 .
#include<stdio.h>
class coord
{
static float x;
float y;
public:
coord(float a):y(a)
{
}
static void f_stat()
{
puts( =);
scanf(%f,&x);
printf(x=%f\n,x);
}
void f_non _stat()
{
puts( =);
scanf(%f,&x);
printf(x=%f y=%f\n,x,y);
}
}
float coord::x=12.5;// .
void main()
{
coord w(45);// w.x=12.5;w.y=45.
w.f_stat();//, this // .
w.f_non_stat();
coord::f_stat();// // .
}
. y. - f_stat() x. y . - . - f_non_stat() x. , , static .
-
const -. . :
Class coord
{
Const int x, y;
public:
coord (int a, int b): x(a), y(b)
{
}
};
-, -.
, . . , -. - . (, ) -. .
|
|
|
onst. :
Class A
{
===========
};
Void main ()
{
const A w; // w -
}
- :
Class A
{
===========
public:
_ _ () const
{
===========
}
};
.
# include <stdio.h>
Class A
{
Int x, y;
public:
A ()
{
}
A (int a, int b)
{
x=a;
y=b;
}
//
//
Void p_const () const
{
x=12; // Cannot modify a const object
y=15; // Cannot modify a const object
}
//
Void p_non_const ()
{
x=12;
y=15;
}
};
Void main ()
{
const A w (1,2); // w -
A q; // q -
w.p_const (); //
q.p_const (); //
w.p_non_const (); // Warning: non-const
// function A::p_non_const () called for
// const object.
// p_non_const () .
}
! -. =12; =15, . , , - . , , p_const () :
Void p_const () const
{
puts ( , );
scanf (%i%i, &x, &y);
}
22
. , class student, class teacher, class officer -, , , . .. class man, , -. : class student, class teacher, class officer. , , -.
.. . , , . :
lass Base
{
.
.
.
};
lass Derived: _ Base
{
.
.
.
};
_ private, protected public. , private public .
_ . .
| _ | ||
| public | ublic rotected private | ublic rotected private |
| protected | ublic rotected private | rotected rotected private |
| private | ublic rotected private | rivate rivate rivate |
- ( ublic).
|
|
|
. , . .
.
lass
{
.
.
. };
lass
{
..
.
};
lass : ublic , ublic
{
.
.
};
. . class man. lass student. , rotected , .
#include<stdio.h>
class man
{
rotected:
char* name;//
char*address;//
int age;//
ublic:
void get_man_info()
{
name=new char[15];
address=new char[20];
puts( );
fflush(stdin);
scanf(%s,name);
puts( );
fflush(stdin);
scanf(%s, address);
puts( );
scanf(%i, &age);
}
void put_man_info()
{
printf( %s. % s. %i\n,name,address,age);
}
}: // man
class student:public man
{
char* group; //
ublic:
void get_stud_info()
{
group =new char[10];
puts( );
fflush(stdin);
scanf(%i, group);
}
void put_stud_info()
{
printf( %s. % s. . % s \n,name,address,age, group);// - .
}
}
void main
{
man x;//
x.get_man_info();
x.put_man_info();
student y; //
y.get_man_info();
y.get_stud_info();
y.put_stud_info();
}
y get_man_info(), - man. y.put_stud_info() y.name, y.address, y.age y.group.
, class student , , class stud_sport (-). class student group rotected. stud_sport - - student, man, student.
