C ++ Programming Test

C++ Programming Test

Free C++ Programming Mock Test: Placement

Practice the free Online C++ Programming Test to get success in future placement. This online mock test will help you in the time of final placements.

General Instructions:

1. Each C ++ Programming test contains 15 questions.
2. Total allotted time is 20 minutes for each test.
3. No negative marking.
4. Try to finish it on time.
5. The Test will be submitted automatically if the time expired.
6. Don’t refresh the page.

Time is Over

C ++ Programming Test 1

1 / 15

Which of the following statement is correct?

A) C++ allows static type checking.

B) C++ allows dynamic type checking.

C) C++ allows static member function be of type const.

D) Both A and B.

2 / 15

Which of the following statement is correct?

A) Only one parameter of a function can be a default parameter.

B) Minimum one parameter of a function must be a default parameter.

C) All the parameters of a function can be default parameters.

D) No parameter of a function can be default.

3 / 15

Which of the following is not a type of inheritance?

A) Multiple

B) Multilevel

C) Distributive

D) Hierarchical

4 / 15

The value 132.54 can represented using which data type?

A) double

B) void

C) int

D) boolean

Explanation :

The given value is with decimal points, so float or double can be used.

5 / 15

What is meant by template parameter?

A) It can be used to pass a type as argument

B) It can be used to evaluate a type.

C) It can of no return type

D) None of the above

Explanation :

A template parameter is a special kind of parameter that can be used to pass a type as argument.

6 / 15

Which is used to do the dereferencing?

A) pointer without asterix

B) value without asterix

C) pointer with asterix

D) value with asterix

Explanation :

Derefencing is using a pointer with asterix. For example, *(abc).

7 / 15

Which of the following gives the memory address of the first element in array?

A) array[0]

B) array[1]

C) array

D) array[2]

8 / 15

Which of the following type of class allows only one object of it to be created?

A) Virtual class

B) Abstract class

C) Singleton class

D) Friend class

9 / 15

Which of the following statement is correct?

A) A constructor is called at the time of declaration of an object.

B) A constructor is called at the time of use of an object.

C) A constructor is called at the time of declaration of a class.

D) A constructor is called at the time of use of a class.

10 / 15

Which of the following correctly declares an array?

A) int array[10];

B) int array;

C) array{10};

D) array array[10];

Explanation :

Because array variable and values need to be declared after the data type only.

11 / 15

What will be the output of the following program?

#include

class AreaFinder

{

float l, b, h;

float result;

public:

AreaFinder(float hh = 0, float ll = 0, float bb = 0)

{

l = ll;

b = bb;

h = hh;

}

void Display(int ll)

{

if(l = 0)

result = 3.14f * h * h;

else

result = l * b;

cout<< result; } }; int main()

{

AreaFinder objAF(10, 10, 20);

objAF.Display(0);

return 0;

}

A) 0

B) 314

C) 314.0000

D) 200.0000

12 / 15

Which of the following statements is correct?

We can return a global variable by reference.
We cannot return a local variable by reference.

A) Only 1 is correct.

B) Only 2 is correct.

C) Both 1 and 2 are correct.

D) Both 1 and 2 are incorrect.

13 / 15

Why reference is not same as a pointer?

A) A reference can never be null.

B) A reference once established cannot be changed.

C) Reference doesn't need an explicit dereferencing mechanism.

D) All of the above.

14 / 15

What is the value of the literal 101?

A) a

B) c

C) B

D) A

Explanation :

The ASCII value of A is 65 and in character literals it can be represented as 101

15 / 15

What is the output of this program?

#include

using namespace std;

int main()

{

int a = 5, b = 10, c = 15;

int arr[3] = {&a, &b, &c};

cout << *arr[*arr[1] – 8]; return 0;

}

A) 15

B) 18

C) garbage value

D) compile time error

Explanation :

The conversion is invalid in this array. So it will give error.

Your score is

The average score is 46%

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Time is Over

C ++ Programming Test 2

1 / 15

How many objects can be created from an abstract class?

A) Zero

B) One

C) Two

D) As many as we want

2 / 15

Which of the following correctly declares an array?

A) int array[10];

B) int array;

C) array{10};

D) array array[10];

Explanation :

Because array variable and values need to be declared after the data type only.

3 / 15

Which of the following statement is correct?

A) Class is an instance of object

B) Object is an instance of a class

C) Class is an instance of data type

D) Object is an instance of data type

4 / 15

Which of the following is correct about function overloading?

A) The types of arguments are different

B) The order of argument is different

C) The number of argument is same

D) Both A and B

5 / 15

Which operator is used to declare the destructor?

A) #

B) $

C) ~

D) @

6 / 15

For automatic objects, constructors and destructors are called each time the objects

A) enter and leave scope

B) inherit parent class

C) are constructed

D) are destroyed

7 / 15

Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class?

A) Preprocessor

B) Linker

C) Loader

D) Compiler

8 / 15

Which of the following provides a reuse mechanism?

A) Abstraction

B) Inheritance

C) Dynamic binding

D) Encapsulation

9 / 15

What is the output of the following?

#include

using namespace std;

int main()

{

char ch = ‘c’

cout << (int(c) + 1);

return 0;

}

A) 99 + 1

B) 100

C) c + 1

D) 100 + 1

Explanation :

The ASCII value of c is 99. hence after the expression is evaluated and 100 is printed.

10 / 15

Which of the following gives the memory address of the first element in array?

A) array[0]

B) array[1]

C) array

D) array[2]

11 / 15

Which of the following is not a type of constructor?

A) Copy constructor

B) Friend constructor

C) Default constructor

D) Parameterized constructor

12 / 15

Which of the following statement is correct?

A) A constructor of a derived class can access any public and protected member of the base class

B) Constructor cannot be inherited but the derived class can call them.

C) A constructor of a derived class cannot access any public and protected member of the base class.

D) Both A and B

13 / 15

What will be the output of the following program?

#include

int BixFunction(int a, int b = 3, int c = 3)

{

cout<< ++a * ++b * --c ; return 0;

}

int main()

{

BixFunction(5, 0, 0);

return 0;

}

A) 8

B) 6

C) – 6

D) – 8

14 / 15

Which of the following correctly describes overloading of functions?

A) Virtual polymorphism

B) Transient polymorphism

C) Ad-hoc polymorphism

D) Pseudo polymorphism

15 / 15

What is the validity of template parameters?

A) inside that block only

B) inside the class

C) whole program

D) any of the above mentioned

Your score is

The average score is 50%

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Time is Over

C ++ Programming Test 3

1 / 15

Which of the following statements is correct in C++?

A) Classes cannot have data as protected members

B) Structures can have functions as members

C) Class members are public by default.

D) Structure members are private by default.

2 / 15

Which of the following approach is adapted by C++?

A) Top-down

B) Bottom-up

C) Right-left

D) Left-right

3 / 15

Which of the following statement is correct?

A) Overloaded functions can accept same number of arguments.

B) Overloaded functions always return value of same data type.

C) Overloaded functions can accept only same number and same type of arguments.

D) Overloaded functions can accept only different number and different type of arguments.

4 / 15

What are the values of a and b?

int a = false

bool b = 99

A) 1, true

B) 1, false

C) 0, true

D) 0, false

5 / 15

What features make C++ so powerful?

A) Easy implementation

B) Code reusability

C) Easy memory management

D) All the above

6 / 15

Which of the following statement is correct about the program given below?

#include

int main()

{

int x = 80;

int y& = x;

x++;

cout << x << " " << --y; return 0;

}

A) The program will print the output 80 80.

B) The program will print the output 81 80.

C) The program will print the output 81 81.

D) It will result in a compile time error.

7 / 15

Which of the following statement is correct about the references?

A) A reference must always be initialized within functions.

B) A reference must always be initialized outside all functions.

C) A reference must always be initialized.

D) Both A and C.

8 / 15

Which of the following statements is correct?

1. Once the variable and the reference are linked they are tied together.

2. Once the reference of a variable is declared another reference of that variable is not allowed.

A) Only 1 is correct.

B) Only 2 is correct.

C) Both 1 and 2 are correct.

D) Both 1 and 2 are incorrect.

9 / 15

Which of the following operator is overloaded for object cout ?

A) >>

B) <<

C) +

D) *

10 / 15

What are the things that are inherited from the base class?

A) Constructor and its destructor

B) Operators & members

C) Friend functions

D) All of the above mentioned

11 / 15

Which of the following statements are correct?

A) Constructor is always called explicitly.

B) Constructor is called either implicitly or explicitly, whereas destructor is always called implicitly.

C) Destructor is always called explicitly.

D) Constructor and destructor functions are not called at all as they are always inline.

12 / 15

What is correct about the following program?

#include

class Base

{

int x, y, z;

public:

Base()

{

x = y = z = 0;

}

Base(int xx, int yy = ‘A’, int zz = ‘B’)

{

x = xx;

y = x + yy;

z = x + y;

}

void Display(void)

{

cout<< x << ” “ << y << ” “ << z << endl; } }; class Derived : public Base

{

int x, y;

public:

Derived(int xx = 65, int yy = 66) : Base(xx, yy)

{

y = xx;

x = yy;

}

void Display(void)

{

cout<< x << ” “ << y << ” “;

Display();

}

};

int main()

{

Derived objD;

objD.Display();

return 0;

}

A) The program will report compilation error.

B) The program will run successfully giving the output 66 65.

C) The program will run successfully giving the output 65 66.

D) The program will run successfully giving the output 66 65 65 131 196.

E) The program will produce the output 66 65 infinite number of times (or till stack memory overflow).

13 / 15

Which of the following literal integer constants are hexadecimal?

A) 0x1a

B) 024

C) 01100100

D) hex01100100

Explanation:

Literal integer constants that begin with 0x or 0X are interpreted as hexadecimal.

14 / 15

A __________ is a special method used to initialize the instance variable of a class.

A) member function

B) destructor

C) constructor

D) structure

15 / 15

What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

A) Compile-time error

B) Preprocessing error

C) Runtime error

D) Runtime exception

Your score is

The average score is 41%

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Time is Over

C ++ Programming Test 4

1 / 15

It is a __________ error to pass arguments to a destructor.

A) logical

B) virtual

C) syntax

D) linker

2 / 15

Which of the following statement will be correct if the function has three arguments passed to it?

A) The trailing argument will be the default argument

B) The first argument will be the default argument

C) The middle argument will be the default argument

D) All the argument will be the default argument

3 / 15

Which of the following statement is correct?

A) An array of references is acceptable

B) Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.

C) An array of references is not acceptable

D) Reference is like a structure

4 / 15

Which rule will not affect the friend function?

A) private and protected members of a class cannot be accessed from outside

B) private and protected member can be accessed anywhere

C) both a & b

D) None of the above

Explanation :

Friend is used to access private and protected members of a class from outside the same class.

5 / 15

What is the output of this program?

#include

using namespace std;

int main ()

{

string str (“steve jobs is legend”);

string::iterator it;

str.erase (str.begin()+ 5, str.end()-7);

cout << str << endl; return 0; }

A) jobs is

B) steve legend

C) steve

D) legend

Explanation :

Here, We are leaving the first 5 characters and last 7 characters and we are erasing the remaining the characters.

6 / 15

Which of the following factors supports the statement that reusability is a desirable feature of a language?

A) It decreases the testing time

B) It lowers the maintenance cost.

C) It reduces the compilation time

D) Both A and B

7 / 15

What will be the output of the following program?

#include

class BixBase

{

public:

BixBase()

{

cout<< "Base OK. “;

}

~BixBase()

{

cout<< “Base DEL. “;

}

};

class BixDerived: public BixBase

{

public:

BixDerived()

{

cout<< “Derived OK. “;

}

~BixDerived()

{

cout<< “Derived DEL. “;

}

};

int main()

{

BixBase *basePtr = new BixDerived();

delete basePtr;

return 0;

}

A) Base OK. Derived OK.

B) Base OK. Derived OK. Base DEL.

C) Base OK. Derived OK. Derived DEL.

D) Base OK. Derived OK. Derived DEL. Base DEL.

8 / 15

Which of the following statement is correct?

A) The default value for an argument cannot be function call.

B) C++ allows the redefinition of a default parameter.

C) Both A and B.

D) C++ does not allow the redefinition of a default parameter.

9 / 15

Which of the following statements is correct?

A) Base class pointer cannot point to derived class.

B) Derived class pointer cannot point to base class.

C) Pointer to derived class cannot be created.

D) Pointer to base class cannot be created.

10 / 15

Which of the following is user defined data type?

A) public

B) private

C) class

D) both A and B

11 / 15

What happens if the base and derived class contains definition of a function with same prototype?

A) Compiler reports an error on compilation.

B) Only base class function will get called irrespective of object.

C) Only derived class function will get called irrespective of object.

D) Base class object will call base class function and derived class object will call derived class function.

12 / 15

Which of the following is a mechanism of static polymorphism?

A) Operator overloading

B) Function overloading

C) Templates

D) All of the above

13 / 15

Which of the following statements is correct?

A) Data items in a class must be private.

B) Both data and functions can be either private or public.

C) Member functions of a class must be private.

D) Constructor of a class cannot be private.

14 / 15

Which concept uses the preincrement?

A) call by value

B) call by reference

C) call by function

D) queue

15 / 15

What is the output of this program?

#include

using namespace std;

int main()

{

complex i(2, 3);

i = i * 6 / 3;

cout << i; return 0; }

A) (4, 6)

B) (2, 3)

C) (6, 12)

D) None of the above

Your score is

The average score is 39%

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Time is Over

C ++ Programming Test 5

1 / 15

What is the output of this program?

#include

using namespace std;

int main()

{

complex i(2, 3);

i = i * 6 / 3;

cout << i; return 0; }

A) (4, 6)

B) (2, 3)

C) (6, 12)

D) None of the above

2 / 15

Which of the following gets called when an object is being created?

A) constructor

B) virtual function

C) destructor

D) main

3 / 15

It is a __________ error to pass arguments to a destructor.

A) logical

B) virtual

C) syntax

D) linker

4 / 15

Which of the following also known as an instance of a class?

A) Friend Functions

B) Object

C) Member Functions

D) Member Variables

5 / 15

Which of the following is not a type of constructor?

A) Copy constructor

B) Friend constructor

C) Default constructor

D) Parameterized constructor

6 / 15

What does the dereference operator will return?

A) rvalue equivalent to the value at the pointer address

B) lvalue equivalent to the value at the pointer address.

C) it will return nothing

D) none of the above

Explanation :

It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address.

7 / 15

Which of the following statement is correct?

A) Overloaded functions can have at most one default argument.

B) An overloaded function cannot have default argument.

C) All arguments of an overloaded function can be default.

D) A function if overloaded more than once cannot have default argument.

8 / 15

When are the Global objects destroyed?

A) When the control comes out of the block in which they are being used.

B) When the program terminates.

C) When the control comes out of the function in which they are being used.

D) As soon as local objects die.

9 / 15

Destructor has the same name as the constructor and it is preceded by ______ .

A) !

B) ?

C) ~

D) $

10 / 15

Everything defined at the program scope level (ie. outside functions and classes) is said to be ……………

A) local scope

B) regional scope

C) global scope

D) static scope

11 / 15

Which of the following operator can’t be overloaded?

A) ::

B) +

C) –

D) []

12 / 15

Can a class have virtual destructor?

A) Yes

B) No

13 / 15

Which of the following statement is correct about destructors?

A) A destructor has void return type.

B) A destructor has integer return type.

C) A destructor has no return type.

D) A destructors return type is always same as that of main().

14 / 15

Which of the following gets called when an object goes out of scope?

A) constructor

B) destructor

C) main

D) virtual function

15 / 15

cout is a/an __________ .?

A) operator

B) function

C) object

D) macro

Your score is

The average score is 52%

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