C++ Programming MCQ - VIDYA VICHAR

Welcome to your C++ Programming MCQ

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 the const keyword in C++?

Declares a constant

None of the above

Defines a class member function

Prevents modification of variable

None

How do you define a constant in C++?

int CONSTANT = 10;

const int CONSTANT = 10;

constant CONSTANT = 10

define CONSTANT 10

None

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

None of the above

1.5

None

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

int var;

variable var;

var int;

integer var;

None

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

None of the above

Writes output to the console

Reads input from the user

Defines a structure

None

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

func(array);

func(*array);

func(&array);

func(array[]);

None

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

None of the above

Declares a constant

Allocates memory statically

Limits the scope of variables/functions

None

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

Exits the loop

Exits the switch statement

None of the above

Continues to the next case

None

10.

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

Prevents double inclusion of a header file

Checks if a header file has been included

Defines a new macro

None of the above

None

11.

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

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

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

int arr[3];

int arr[];

None

12.

How do you dynamically allocate memory in C++?

malloc(size);

new size;

allocate(size);

new(size);

None

13.

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

*var;

var&;

&var;

address(var);

None

14.

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

To indicate that the function takes no arguments

To specify the return type of the function

To indicate the number of arguments the function takes

None of the above

None

15.

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

Declares the main function

Defines a structure

Includes the input/output stream library

None of the above

None

16.

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

Prints the address pointed to by ptr

Prints the size of ptr

None of the above

Prints the value of ptr

None

17.

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

Prints the size of a float

None of the above

Prints the size of a character

Prints the size of an integer

None

18.

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

arr[2];

arr.3;

arr(2);

arr(3);

None

19.

How do you concatenate two strings in C++?

Using sprintf() function

Using strncat() function

Using strcat() function

Using strcpy() function

None

20.

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

Compares two strings lexicographically

Concatenates two strings

Copies one string to another

None of the above

None

21.

How do you define a class in C++?

typedef class { ... } MyClass;

class MyClass { ... };

define class MyClass { ... };

class { ... } MyClass;

None

22.

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

delete ptr;

free(ptr);

None of the above

remove(ptr);

None

23.

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

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

char ch = getchar();

None of the above

char ch = read();

None

24.

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

ofstream file("data.txt");

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

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

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

None

25.

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

int ptr();

int *ptr;

pointer(int) ptr;

ptr int;

None

26.

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

void func() virtual;

func virtual void();

void virtual func();

virtual void func() = 0;

None

27.

What is the purpose of new in C++?

Allocates memory dynamically

Initializes memory

Deletes allocated memory

None of the above

None

28.

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

virtual void func() = 0;

void func() virtual;

func virtual void();

void virtual func();

None

29.

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

int arr[][];

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

int arr[][3];

int arr[][][];

None

30.

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

None of the above

Declares a friend function

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

Defines a new data type

None

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