Online C++ Programming Test - C++ Programming Test 2

Instruction:

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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All the best!

Which of the following functions are performed by a constructor?

Construct a new class

Construct a new object

Construct a new function

Initialize objects

[#]

Which of the following is an abstract data type?

int

double

string

Class

[#]

Which of the following is not a type of constructor?

Copy constructor

Friend constructor

Default constructor

Parameterized constructor

[#]

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

Classes cannot have data as protected members.

Structures can have functions as members.

Class members are public by default.

Structure members are private by default.

[#]

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

Top-down

Bottom-up

Right-left

Left-right

[#]

In which of the following a virtual call is resolved at the time of compilation?

From inside the destructor.

From inside the constructor.

From inside the main().

Both A and B.

[#]

What will be the output of the following program?

#include<iostream.h> 
class Bix
{
    int x, y; 
    public:
    void show(void);
    void main(void);
};
void Bix::show(void)
{ 
    Bix b;
    b.x = 2;
    b.y = 4;
    cout<< x << " " << y;
}
void Bix::main(void)
{
    Bix b;
    b.x = 6; 
    b.y = 8;
    b.show();
}
int main(int argc, char *argv[])
{
    Bix run;
    run.main();
    return 0; 
}

2 4

6 8

The program will report error on Compilation.

The program will report error on Linking.

The program will report error on Run-time.

[#]

Which of the following statement is correct about the references?

A reference must always be initialized within functions.

A reference must always be initialized outside all functions.

A reference must always be initialized.

Both A and C.

[#]

Which of the following statement is correct?

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

A reference is indicated by using && operator.

Once a reference variable has been defined to refer to a particular variable it cannot refer to any other variable.

A reference can be declared beforehand and initialized later.

[#]

10.

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

#include<iostream.h> 
int main()
{
    int x = 80; 
    int y& = x;
    x++;
    cout << x << " " << --y;
    return 0;
}

The program will print the output 80 80.

The program will print the output 81 80.

The program will print the output 81 81.

It will result in a compile time error.

[#]

11.

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

#include<iostream.h> 
int main()
{
    int x = 80; 
    int &y = x;
    x++;
    cout << x << " " << --y;
    return 0;
}

The program will print the output 80 80.

The program will print the output 81 80.

The program will print the output 81 81.

It will result in a compile time error.

[#]

12.

What will be the output of the following program?

#include <iostream.h> 
enum xyz 
{
    a, b, c
}; 
int main()
{
    int x = a, y = b, z = c; 
    int &p = x, &q = y, &r = z; 
    p = z; 
    p = ++q;
    q = ++p;
    z = ++q + p++; 
    cout<< p << " " << q << " " << z;
    return 0; 
}

2 3 6

4 4 7

4 5 8

3 4 6

[#]

13.

Which of the following statement is correct regarding destructor of base class?

Destructor of base class should always be static.

Destructor of base class should always be virtual.

Destructor of base class should not be virtual.

Destructor of base class should always be private.

[#]

14.

What will be the output of the following program?

#include<iostream.h>
#include<string.h> 
class IndiaBix
{
    int val; 
    public:
    void SetValue(char *str1, char *str2)
    {
        val = strcspn(str1, str2);
    }
    void ShowValue()
    {
        cout<< val;
    } 
};
int main() 
{
    IndiaBix objBix;
    objBix.SetValue((char*)"India", (char*)"Bix"); 
    objBix.ShowValue(); 
    return 0; 
}

[#]

15.

A function with the same name as the class, but preceded with a tilde character (~) is called __________ of that class.

constructor

destructor

function

object

[#]

16.

Which of the following statements are correct?

Constructor is always called explicitly.

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

Destructor is always called explicitly.

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

[#]

17.

How many times a constructor is called in the life-time of an object?

Only once

Twice

Thrice

Depends on the way of creation of object

[#]

18.

Which of the following constructor is used in the program given below?

#include<iostream.h> 
class IndiaBix
{
    int x, y; 
    public:
    IndiaBix(int xx = 10, int yy = 20 )
    {
        x = xx; 
        y = yy;
    }
    void Display()
    {
        cout<< x << " " << y << endl;
    } 
    ~IndiaBix()
    { } 
};
int main()
{
    IndiaBix objBix; 
    objBix.Display(); 
    return 0;
}

Copy constructor

Simple constructor

Non-parameterized constructor

Default constructor

[#]

19.

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

#include<iostream.h> 
class IndiaBix
{
    int x; 
    public:
    IndiaBix(short ss)
    {
        cout<< "Short" << endl;
    }
    IndiaBix(int xx)
    {
        cout<< "Int" << endl;
    }
    IndiaBix(float ff)
    {
        cout<< "Float" << endl;
    }
    ~IndiaBix() 
    {
        cout<< "Final";
    }
};
int main()
{
    IndiaBix *ptr = new IndiaBix('B');
    return 0; 
}

The program will print the output Short .

The program will print the output Int .

The program will print the output Float .

The program will print the output Final .

None of the above

[#]

20.

What will be the output of the following program?

#include<iostream.h>
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;
}

Base OK. Derived OK.

Base OK. Derived OK. Base DEL.

Base OK. Derived OK. Derived DEL.

Base OK. Derived OK. Derived DEL. Base DEL.

Base OK. Derived OK. Base DEL. Derived DEL.

[#]

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