Encapsulation, Data Hiding - Introduction to Programming - Lecture Slides, Slides of Computer Programming

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Introduction to Programming

Lecture 29

Private

Public

Friend

Friend Function

Friend Function

class Date

friend functionName ( Argument_list ) ;

Example 1

class myClass

{

friend increment ( myClass , int ) ; private: int topSecret ; public: myClass ( ) { topSecret = 100 ; } void Display ( ) { cout<< “The value of topSecret is “ << topSecret ; }

} ; Docsity.com

Example 1

void Increment ( myClass A , int i )

{

A.topSecret += i ;

}

Example 1: Output

The value of topSecret is 100

The value of topSecret is 110

Example 2

class myClassTwo ;

class myClassOne

{

private : int topSecret ; public : void Display ( ) ; myClassOne ( ) { topSecret = 100; } friend AddBoth ( myClassOne , myClassTwo ) ;

} ;

Example 2

main ( )

myClassOne A ;

myClassTwo B ;

A.Display ( ) ;

B.Display ( ) ;

AddBoth ( A , B ) ;

Example 2

int AddBoth ( myClassOne A , myClassTwo B )

{

cout << “The value of topSecret in myClassOne object is” << A.topSecret ;

cout << “The value of topSecret in myClassTwo object is”<< B.topSecret ;

cout << “The sum of topSecret values in “ << “myClassOne and myClassTwo object is ” << A.topSecret + B.topSecret ;

}

y = mx + c

Slope (^) Intercept on y axis

Straight Line

Straight Line

class straightLine

double slope , intercept ;

// member function

Quadratic

class quadratic

{

private :

double a , b , c ;

// member function

} ; Docsity.com

Limitations

It is NOT Transitive

It is NOT Associative