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Object Oriented Programming - Classes

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6. Choose the correct statements from the following:

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7. The fields in a class, of a C++ program are by default

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8. Class A

{

int  i1;

protected :

int  i2;

public :

int i3;

}

class B : public A

{

public :

int i4;

};

class C :B

{

};

The variable i2 is accessible

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9. Class A

{

int  i1;

protected :

int  i2;

public :

int i3;

}

class B : public A

{

public :

int i4;

};

class C :B

{

};

Which variable(s) is/are accessible from the main function?    

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10. The following program
class abc;
class def
{
int i1 ;                        // statement 1
protected: int i2;   // statement 2
public: int i3;       //statement 3
friend abc;
} ;
class abc
{
public:
void main(def A)
{
cout << (A.i1=3);
cout <<  (A.i2=4);
cout << (A.i3=5);
}
} ;
void main( )
{
def x1 ;
abc x2 ;
x2.mn(x1);
}

  • Option : D
  • Explanation : Since abc is a friend of def, it can access all its data, does not matter whether it is declared private, protected or public.
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