C++ Multiple Choice Question
Question : 1 What is the correct syntax to define a function in C++?
A
function myFunction() {};
B
void myFunction() {}
C
def myFunction() {}
D
def myFunction():
Answer:
Question : 2 Which data type in C++ is used to store a single character?
A
char
B
int
C
string
D
float
Answer:
Question : 3 What is the output of the following code snippet: int x = 5; cout << x++;
A
5
B
6
C
Compiler Error
D
Undefined Behavior
Answer:
Question : 4 Which operator is used to allocate memory for a variable in C++?
A
new
B
malloc
C
alloc
D
allocate
Answer:
Question : 5 What is the correct way to access the "age" member variable of an object "person" of class "Person" in C++?
A
person.age;
B
person->age;
C
person::age;
D
person[age];
Answer:
Question : 6 Which keyword is used to inherit a class in C++?
A
extend
B
inherits
C
extend class
D
inherit
Answer:
Question : 7 What is the output of the following code snippet: int x = 10; int y = x++ + ++x; cout << y;
A
20
B
21
C
22
D
Compiler Error
Answer:
Question : 8 Which of the following is NOT a valid C++ comment?
A
// This is a comment
B
/* This is a comment */
C
# This is a comment
D
// This is another comment
Answer:
Question : 9 What is the purpose of the "endl" manipulator in C++?
A
It ends the program execution.
B
It moves the cursor to the next line.
C
It clears the output buffer.
D
It inserts a new line character.
Answer:
Question : 10 What is the function of the "cin" object in C++?
A
To display output on the console.
B
To write data to a file.
C
To read input from the console.
D
To allocate memory.
Answer:
Question : 11 What does the "static" keyword mean when used with a class member in C++?
A
It specifies that the member is accessible only within its class.
B
It indicates that the member should not be initialized.
C
It signifies that the member is shared among all objects of the class.
D
It defines a constant member.
Answer:
Question : 12 Which operator is used to access the member functions and variables of a class in C++?
A
->
B
.
C
::
D
:
Answer:
Question : 13 What is the correct way to declare a reference variable in C++?
A
int &x = 10;
B
int* x;
C
int& x = y;
D
int x = &y;
Answer:
Question : 14 What is the output of the following code snippet: int arr[5] = {1, 2, 3}; cout << arr[3];
A
0
B
1
C
2
D
Undefined Behavior
Answer:
Question : 15 What does the "sizeof" operator return in C++?
A
The address of a variable.
B
The size of a datatype in bytes.
C
The value of a variable.
D
The datatype of a variable.
Answer:
Question : 16 What is the function of the "break" statement in a switch case statement in C++?
A
To skip the current iteration of a loop.
B
To exit the switch case block.
C
To terminate the program execution.
D
To continue to the next case.
Answer:
Question : 17 What is the purpose of the "continue" statement in C++?
A
To exit the loop.
B
To jump to the next iteration of the loop.
C
To return from a function.
D
To print the loop index.
Answer:
Question : 18 What is the difference between "++i" and "i++" in C++?
A
"++i" increments the value of i and returns the new value, while "i++" returns the value of i and then increments it.
B
"++i" increments the value of i, while "i++" decrements it.
C
"++i" decrements the value of i and returns the new value, while "i++" returns the value of i and then decrements it.
D
"++i" and "i++" have the same functionality.
Answer:
Question : 19 What is the output of the following code snippet: int x = 5, y = 10; cout << (x > y ? x : y);
A
5
B
10
C
Compiler Error
D
10
Answer:
Question : 20 Which of the following statements is true about the "virtual" keyword in C++?
A
It is used to declare a pure virtual function.
B
It specifies that a function can be overridden in derived classes.
C
It is used to define a function inside a class.
D
It is used to prevent inheritance.
Answer:
Question : 21 What is the purpose of the "typeid" operator in C++?
A
To determine the type of an object at runtime.
B
To perform dynamic casting.
C
To perform static casting.
D
To determine the size of an object.
Answer:
Question : 22 What is the syntax for creating an object of class "MyClass" using dynamic memory allocation in C++?
A
MyClass obj();
B
MyClass obj = new MyClass();
C
MyClass* obj = new MyClass();
D
MyClass obj = new MyClass;
Answer:
Question : 23 What is the purpose of the "friend" keyword in C++?
A
To specify the base class in inheritance.
B
To declare a function or class as a friend, granting it access to private and protected members of the class.
C
To declare a function as a member of a class.
D
To specify the derived class in inheritance.
Answer:
Question : 24 Which of the following statements about templates in C++ is true?
A
Templates are used to define generic classes and functions.
B
Templates can only be used with built-in data types.
C
Templates are used to define private members of a class.
D
Templates are not supported in C++.
Answer:
Question : 25 What is the difference between "new" and "malloc()" in C++?
A
"new" is an operator used for dynamic memory allocation and also calls the constructor, while "malloc()" is a function used for dynamic memory allocation without calling the constructor.
B
"new" is used for static memory allocation, while "malloc()" is used for dynamic memory allocation.
C
"new" is used for array allocation, while "malloc()" is used for single variable allocation.
D
"new" is a function used for dynamic memory allocation and also calls the constructor, while "malloc()" is an operator used for dynamic memory allocation without calling the constructor.
Answer:
Question : 26 What is the purpose of the "delete" operator in C++?
A
To deallocate memory allocated using "new".
B
To deallocate memory allocated using "malloc()".
C
To delete a file from the file system.
D
To remove an element from a container.
Answer:
Question : 27 What is the difference between "private" and "protected" access specifiers in C++ classes?
A
"private" members are accessible only within the same class, while "protected" members are accessible within the same class and its derived classes.
B
"private" members are accessible within the same class and its derived classes, while "protected" members are accessible only within the same class.
C
"private" members are accessible from anywhere in the program, while "protected" members are accessible only within the same class.
D
"private" members are accessible only within the same class, while "protected" members are accessible from anywhere in the program.
Answer:
Question : 28 What is function overloading in C++?
A
It refers to the ability to define multiple functions with the same name but different return types.
B
It refers to the ability to define multiple functions with the same name but different access specifiers.
C
It refers to the ability to define multiple functions with the same name but different parameter lists.
D
It refers to the ability to define multiple functions with the same name but in different classes.
Answer:
Question : 29 What is a constructor in C++?
A
It is a function that is called when an object is created.
B
It is a function that is called when an object is destroyed.
C
It is a function that is called when an object is modified.
D
It is a function that is called when an object is copied.
Answer:
Question : 30 What is the purpose of the "this" pointer in C++?
A
To store the address of the current object.
B
To store the address of the previous object.
C
To store the address of the next object.
D
To store the address of the main function.
Answer:
Question : 31 What is the difference between "class" and "struct" in C++?
A
There is no difference between "class" and "struct" in C++.
B
In a "class", members are private by default, while in a "struct", members are public by default.
C
In a "class", members are public by default, while in a "struct", members are private by default.
D
In a "class", members are protected by default, while in a "struct", members are private by default.
Answer:
Question : 32 What is the purpose of inheritance in C++?
A
To create multiple instances of a class.
B
To allow a class to inherit properties and behaviors from another class.
C
To prevent other classes from accessing certain members of a class.
D
To restrict the access to certain members of a class.