Inclass Test

7/27/2019 Inclass Test

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Q 1. How many values can be returned by a C++ function?

1

Infinity

0

None of the Above

Q 2. Virtual functions are defined in

Derived class

Base class

Both A and B

None of the Above

Q 3. cin in C++ program uses the operator

>>

<

<<

>

Q 4. Which of the following denotes advantages of operator overloading?

Operator not limited to operate only with primitive Data Type

Extensibility

Both A and B

None of the Above

Q 5. The friend function of a class in C++ can access

Private members of the class

protected members of the class

Both A and B

None of the Above

Q 6. When dynamically allocated memory is lost to the C++ program then

warning occurs

memory leak occurs

The program does not executes successfully

None of the above



Q 7. The operator that denotes address of a variable in C++ program is

*

%

$

&

Q 8. The overriding method must have the which of the followingsame as that of the method in the super class definition

same identifier

same signature

Both A and B

None of the Above

Q 9. Which of the following is used in C++ to create a copy of an object?

Assignment operator

Copy constructor

Both A) and B)

None of the Above

Q 10. Which of the following is used to group a set of global classes,

objects and functions under a name?

Area named

Namearea

Namespaces

None of the above

Q 11. Inheritance in C++ have default access specifier as

Private

Public

Protected

None of the Above

Q 12. The members of a class are by default

Private

Public

Protected

None of the Above

Q 13.



// All the necessary libraries have been included

// Consider the following code:

void swap(int& a, int b)

{

long temp;

temp=a;

a=b;

b=temp;

}

// If we have int x = 5 and y = 3,

// what are values of x and y after swap(x,y) being called?

x=3, y=3

x=5, y=3

x=3, y=5

x=5, y=5

Q 14.



void g(int& a) {

a = 13 ;

}

int f() {

int a = 42 ;

g( a ) ;

return a ;

}

// What value is returned if f() is called?

13

42

0

There is a compile error in the code

Q 15.

void f() {



int *p = new(nothrow) int ;

if ( p!=0 ) {

*p = 99 ;

delete p ;

cout << *p << endl ;

}

}

// What value is printed if f() is called?

Unknown value

99

0

The code has a compile error

Q 16.



void f() {

int *p = new(nothrow) int ;

if ( p!=0 ) {

*p = 99 ;

delete p ;

p = NULL;

cout << *p << endl ;

}

}


The program will crash

99

0

NULL

Q 17.



void f() {



int x = 10;

int* const p = &x;

*p = 5;

cout << *p << endl;

}


5

10

0

The code has a compile error.

Q 18.



void f() {

int x = 10;

int y = 20;

int* const p = &x;

*p = 5;

p = &y;

cout << *p << endl;

}



5

20

0

Q 19.



void f() {

const int x = 10;

const int* p = &x;

*p = 5;

ko thay doi bien



cout << *p << endl;

}



5

10

0

Q 20.



class A {

int x, y;

public:

void fa(int a) {

cout << a + x + y;

}

};

class B : public A {

public:

void fb() {

A a;

a.x = 3;

a.y = 5;

a.fa(10);

}

};

// What value is printed if fb() method of class B is called?


18

10

0

Q 21.

private





class A {

int x, y;

public:

void fa(int a) {

cout << a + x + y;

}

friend class B;

};

class B : A {

public:

void fb() {

A a;

a.x = 3;

a.y = 5;

a.fa(10);

}

};


18

10

0


Q 22.



class A {

protected:

int x, y;

public:

void fa(int a) {

cout << a + x + y;



}

};


public:

void fb() {

A a;

a.x = 3;

a.y = 5;

a.fa(10);

}

};



10

0

18

Q 23.



class A {

int x, y;

public:

void fa(int a, int b) {

cout << a + b;

}

void fa(double a, double b) {

cout << a + b;

}

void fa(int a, double b) {

cout << a + b;

}

};

// What value is printed if the following code is executed?



// A a; a.fa(2, 3.2);

5.2

5

0.2


Q 24.



class A {

int x, y;

public:

void f() {

cout << "father";

}

};


public:

void f() {

cout << "son";

}

};


// A* a = new B; a->f();

Father

Son

Fatherson


Q 25.



class A {

int x, y;

public:



void virtual f() {

cout << "father";

}

};


public:

void virtual f() {

cout << "son";

}

};


// A* a = new B; a->f();

Son

Father

Sonfather


Q 26.



class A {

public:

int age;

char * name;

void print() const {

++age;

cout << age << ", " << name << endl;

}

};


// A a1;

// a1.age = 20; a1.name = "peter";

// a1.print();




21, peter

20, peter

22, peter

Q 27.



#define SIZE 5

class A {

public:

void increase(const int* grade) const {

for (int i = 0; i < SIZE; i++) {

grade[i] +=1;

}

}

void sum() {

int sum = 0;

int grade[] = {1,2,3,4,5};

increase(grade);

for (int i = 0; i < SIZE; i++) {

sum += grade[i];

}

cout << sum/SIZE << endl;

}

};


// A a1; a1.sum();

There is a compile error in the code.

4

3

5



Q 28

class Person{ public:

Person(int p1){

cout << this->p1;}

};

class Student : public Person{ public:

Student(int i){

cout << this->i;}

};

int _tmain(int argc, _TCHAR* argv[])

{Person(123);Student(111);getch();return 0;

}//What is the output??

123, 111

111, 123

The program has compiling errors.

The program will crash when executing

Q 29: What are the roles of constructor?

Q 30: If class A inherits from class B, which inherits from class C, what is the order of calling constructors and destructors?

Q 31: class Student has 2 private members: int age, string address. The Student class has a constructor that takes age and addrarguments.

Implement an overloaded assignment operator that allows comparing two objects of the Student class. The two student’s objeare equal if both their age and address are equal.



Q 32 Find errors if any






Q 36 Improve the following code

Inclass Test

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