C++ Programming MCQ - VIDYA VICHAR

Welcome to your C++ Programming MCQ

What is the purpose of the const keyword in C++?

Defines a class member function

Declares a constant

Prevents modification of variable

None of the above

None

What is the correct way to initialize an array in C++?

int arr[3] = {1, 2, 3};

arr[] = {1, 2, 3};

int arr[];

int arr[3];

None

How do you write a for loop in C++ that iterates 5 times?

for (int i = 0; i < 5; i++) { ... }

for i = 0 to 4 { ... }

for (i = 0; i < 5; i++) { ... }

for (i = 1; i <= 5; i++) { ... }

None

What is the purpose of new in C++?

Initializes memory

Allocates memory dynamically

Deletes allocated memory

None of the above

None

How do you pass an array to a function in C++?

func(array);

func(*array);

func(&array);

func(array[]);

None

How do you concatenate two strings in C++?

Using strcat() function

Using strncat() function

Using strcpy() function

Using sprintf() function

None

How do you declare a virtual function in C++?

void func() virtual;

void virtual func();

func virtual void();

virtual void func() = 0;

None

How do you declare a pure virtual function in C++?

void func() virtual;

void virtual func();

func virtual void();

virtual void func() = 0;

None

How do you access the address of a variable in C++?

var&;

address(var);

&var;

*var;

None

10.

What is the purpose of the cin object in C++?

None of the above

Defines a structure

Writes output to the console

Reads input from the user

None

11.

How do you declare a pointer to an integer in C++?

ptr int;

int *ptr;

pointer(int) ptr;

int ptr();

None

12.

What is the purpose of the break statement in a switch statement in C++?

Continues to the next case

Exits the switch statement

None of the above

Exits the loop

None

13.

How do you open a file named data.txt for writing in C++?

file.open("data.txt", ios::out);

open("data.txt", ios::write);

ofstream file("data.txt");

fopen("data.txt", "w");

None

14.

What does the strcmp() function do in C++?

Concatenates two strings

Copies one string to another

None of the above

Compares two strings lexicographically

None

15.

How do you free dynamically allocated memory in C++?

remove(ptr);

None of the above

delete ptr;

free(ptr);

None

16.

How do you dynamically allocate memory in C++?

allocate(size);

new size;

malloc(size);

new(size);

None

17.

How do you access the third element of an array arr in C++?

arr(2);

arr[2];

arr.3;

arr(3);

None

18.

How do you define a multi-dimensional array in C++?

int arr[][3];

int arr[][][];

int arr[][] = {...};

int arr[][];

None

19.

What is the purpose of the static keyword in C++?

Allocates memory statically

Limits the scope of variables/functions

None of the above

Declares a constant

None

20.

What is the output of cout << sizeof(int); in C++?

None of the above

Prints the size of a character

Prints the size of an integer

Prints the size of a float

None

21.

What is the purpose of friend keyword in C++?

Declares a friend function

Defines a new data type

None of the above

Grants non-member functions access to private and protected members of a class

None

22.

What is the output of cout << 3/2; in C++?

1.5

None of the above

None

23.

What is the purpose of #include directive in C++?

Defines a structure

None of the above

Includes the input/output stream library

Declares the main function

None

24.

What is the purpose of #ifndef directive in C++ header files?

Prevents double inclusion of a header file

Defines a new macro

None of the above

Checks if a header file has been included

None

25.

How do you read a character from the keyboard in C++?

char ch = getchar();

None of the above

char ch = read();

char ch = scanf("%c", &ch);

None

26.

What is the output of printf("%p", ptr); in C++, where ptr is a pointer?

Prints the value of ptr

Prints the size of ptr

Prints the address pointed to by ptr

None of the above

None

27.

How do you declare an integer variable in C++?

int var;

var int;

integer var;

variable var;

None

28.

How do you define a constant in C++?

constant CONSTANT = 10

int CONSTANT = 10;

const int CONSTANT = 10;

define CONSTANT 10

None

29.

What is the purpose of void in function declarations in C++?

To indicate the number of arguments the function takes

None of the above

To indicate that the function takes no arguments

To specify the return type of the function

None

30.

How do you define a class in C++?

class { ... } MyClass;

typedef class { ... } MyClass;

class MyClass { ... };

define class MyClass { ... };

None

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