Entry
C++: Class: Inheritance: Create: Simple: Can you give an example of inheritance?
Sep 30th, 2003 05:54
Knud van Eeden,
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--- Knud van Eeden --- 27 September 2003 - 07:10 pm ------------------
C++: Class: Inheritance: Create: Simple: Can you give an example of
inheritance?
1. In general:
Steps: Overview:
1. -Create a class <yourclassnameparent>:
http://www.faqts.com/knowledge_base/view.phtml/aid/24828/fid/163
2. -Create another class <yourclassnamechild>:
1. To indicate that you want to use inheritance, use the following
notation:
class <yourclassnamechild> : <access modifier> <yourclassnameparent> {
// do something
// e.g. -add new variables, functions and procedures
//
// and or
//
// -overwrite existing variables, functions
// and procedures of that 'parent' class
};
2. So you indicate that your class is inheriting, by writing
1. first the word 'class'
2. followed by the name of 'child' class
3. followed by a colon ':'
4. followed by an access modifier
(like 'private', 'protected', 'public')
5. followed by the name of the 'parent' class
http://www.faqts.com/knowledge_base/view.phtml/aid/24762/fid/163
---
---
2. In specific:
1. -Create a parent class 'addressC':
class addressC {
//
protected:
//
string nameS;
string streetS;
string cityS;
string countryS;
string telephoneS;
string emailS;
//
public:
void PROCView();
//
addressC( string nameS, string streetS, string cityS, string
countryS, string telephoneS, string emailS ); // constructor for
parent class
//
~addressC(); // destructor for parent class
};
2. -Create another child class 'addresscompanyC':
class addresscompanyC : public addressC {
//
private:
//
string companynameS;
//
public:
//
void PROCView();
//
addresscompanyC( string nameS, string streetS, string cityS,
string countryS, string telephoneS, string emailS, string
companynameS );
//
~addresscompanyC(); // destructor
};
3. -Then give the code for the procedures or functions used in that
class:
1. For the parent class:
addressC::addressC( string nameS, string streetS, string
cityS, string countryS, string telephoneS, string emailS ) {
this->nameS = nameS;
this->streetS = streetS;
this->cityS = cityS;
this->countryS = countryS;
this->telephoneS = telephoneS;
this->emailS = emailS;
};
http://www.faqts.com/knowledge_base/view.phtml/aid/16106
addressC::~addressC() {
};
void addressC::PROCView() {
cout << nameS + ' ' + '-' + ' ' + streetS + ' ' + '-' + ' '
+ cityS + ' ' + '-' + ' ' + countryS + ' ' + '-' + ' ' + telephoneS
+ ' ' + '-' + ' ' + emailS + "\n";
};
2. For the child class:
addresscompanyC::addresscompanyC( string nameS, string
streetS, string cityS, string countryS, string telephoneS, string
emailS, string companynameS ) : addressC( nameS, streetS, cityS,
countryS, telephoneS, emailS ) {
this->companynameS = companynameS;
};
void addresscompanyC::PROCView() {
cout << nameS + ' ' + '-' + ' ' + streetS + ' ' + '-' + ' '
+ cityS + ' ' + '-' + ' ' + countryS + ' ' + '-' + ' ' + telephoneS
+ ' ' + '-' + ' ' + emailS + ' ' + '-' + ' ' + companynameS + "\n";
};
addresscompanyC::~addresscompanyC() {
};
4. -Declare the variables which you intend to use with your class:
addressC knudO( "myname", "mystreet
1", "mycity", "mycountry", "01-2345678", "myemail@address" );
addressC vanessaO( "anothername", "anotherstreet
1", "anothercity", "anothercountry", "01-
3456789", "anotheremail@address" );
addresscompanyC knudcompanyO( "myname", "mystreet
1", "mycity", "mycountry", "01-
2345678", "myemail@address", "thecompany1name" );
addresscompanyC vanessacompanyO( "anothername", "anotherstreet
1", "anothercity", "anothercountry", "01-
3456789", "anotheremail@address", "thecompany2name" );
5. -Supply some source code where you use your class:
main() {
// do something
knudO.PROCView();
knudcompanyO.PROCView();
};
6. -This gives alltogether the following source code:
// save e.g. as 'testinheritance.cpp'
#include <iostream.h>
// --- 1. declaration of the 'parent' class --- //
class addressC {
//
// it must be 'protected', because
// the 'child' class must be able to read their values
//
protected:
//
string nameS;
string streetS;
string cityS;
string countryS;
string telephoneS;
string emailS;
//
public:
//
// 1.1.1 a getter for the 'parent' class
void PROCView();
//
// 1.1.2 the 'constructor' for the 'parent' class
addressC( string nameS, string streetS, string cityS, string
countryS, string telephoneS, string emailS );
//
// 1.1.3 the 'destructor' for the 'parent' class
~addressC();
};
// --- 2. declaration of the 'child' class --- //
class addresscompanyC : public addressC {
//
private:
//
string companynameS;
//
public:
//
// 2.1.1 getter for child class
void PROCView();
//
// 2.1.2 constructor for child class
addresscompanyC( string nameS, string streetS, string cityS,
string countryS, string telephoneS, string emailS, string
companynameS ); // constructor for child class
//
// 2.1.3 destructor for child class
~addresscompanyC(); // destructor for child class
};
// --- 1.1 functions and procedures of the 'parent' class ---
//
// 1.1.1 a 'getter' of the 'parent' class
void addressC::PROCView() {
cout << nameS + ' ' + '-' + ' ' + streetS + ' ' + '-' + ' '
+ cityS + ' ' + '-' + ' ' + countryS + ' ' + '-' + ' ' + telephoneS
+ ' ' + '-' + ' ' + emailS + "\n";
};
// 1.1.2 the 'constructor' of the 'parent' class
addressC::addressC( string nameS, string streetS, string
cityS, string countryS, string telephoneS, string emailS ) {
this->nameS = nameS;
this->streetS = streetS;
this->cityS = cityS;
this->countryS = countryS;
this->telephoneS = telephoneS;
this->emailS = emailS;
};
// 1.1.3 the 'destructor' of the 'parent' class
addressC::~addressC() {
};
// --- 2.1 functions and procedures of the 'child' class --- //
// 2.1.1 a 'getter' of the 'child' class
void addresscompanyC::PROCView() {
cout << nameS + ' ' + '-' + ' ' + streetS + ' ' + '-' + ' '
+ cityS + ' ' + '-' + ' ' + countryS + ' ' + '-' + ' ' + telephoneS
+ ' ' + '-' + ' ' + emailS + ' ' + '-' + ' ' + companynameS + "\n";
};
// 2.1.2 the 'constructor' for the 'child' class (which calls
the 'constructor' of the 'parent' class first)
addresscompanyC::addresscompanyC( string nameS, string
streetS, string cityS, string countryS, string telephoneS, string
emailS, string companynameS ) : addressC( nameS, streetS, cityS,
countryS, telephoneS, emailS ) {
this->companynameS = companynameS;
};
// 2.1.3 the 'destructor' of the 'child' class
addresscompanyC::~addresscompanyC() {
};
// --- 3. do something --- //
main() {
//
// 3.1 create and initialize variables representing
that 'parent' class:
//
addressC knudO( "myname", "mystreet
1", "mycity", "mycountry", "01-2345678", "myemail@address" );
addressC vanessaO( "anothername", "anotherstreet
1", "anothercity", "anothercountry", "01-
3456789", "anotheremail@address" );
//
// 3.2 create initialize variables representing that 'child'
class:
//
addresscompanyC knudcompanyO( "myname", "mystreet
1", "mycity", "mycountry", "01-
2345678", "myemail@address", "thecompany1name" );
addresscompanyC vanessacompanyO
( "anothername", "anotherstreet
1", "anothercity", "anothercountry", "01-
3456789", "anotheremail@address", "thecompany2name" );
//
// 3.3 do something
//
// 3.3.1 view variables stored in the variables
representing that 'parent' class:
//
knudO.PROCView();
vanessaO.PROCView();
//
// 3.3.2 view variables stored in the variables
representing that 'child' class:
//
knudcompanyO.PROCView();
vanessacompanyO.PROCView();
};
7. -When you run this source code, you will see e.g. a text screen
with the following information:
> c:\borland\bcc55\bin\bcc32.exe
-Ic:\borland\bcc55\include
-Lc:\borland\bcc55\lib
testinheritance.cpp
> testinheritance.exe
myname - mystreet 1 - mycity - mycountry - 01-2345678 - myemail@address
anothername - anotherstreet 1 - anothercity - anothercountry -
01-3456789 - anotheremail@address
myname - mystreet 1 - mycity - mycountry - 01-2345678 - myemail@address
- thecompany1name
anothername - anotherstreet 1 - anothercity - anothercountry -
01-3456789 - anotheremail@address - thecompany2name
Press any key to continue . . .
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Internet: see also:
C#: Class: Inheritance: Create: Simple: Can you give an example of
inheritance?
http://www.faqts.com/knowledge_base/view.phtml/aid/24889/fid/791
C++: Borland: Compiler: Command: Line: Install: How to install free
Borland command line compiler?
http://www.faqts.com/knowledge_base/view.phtml/aid/24923/fid/163
C++: Class: Inheritance: What is inheritance?
http://www.faqts.com/knowledge_base/view.phtml/aid/24866
Delphi: Class: Inheritance: Create: Simple: Can you give an example of
inheritance?
http://www.faqts.com/knowledge_base/view.phtml/aid/24880/fid/175
Java: Class: Inheritance: Create: Simple: Can you give an example of
inheritance?
http://www.faqts.com/knowledge_base/view.phtml/aid/24891/fid/165
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