C++ MCQs with answers Page - 152

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Q. Which of the following is the correct way to initialize a string in C++?

(A) string str = 'Hello';
(B) string str = "Hello";
(C) string str = H e l l o;
(D) string str = [Hello];

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Q. Which of the following is the correct way to define a function that returns an integer and takes two integers as parameters?

(A) int func(int, int) { }
(B) void func(int, int) { }
(C) int func(int a, int b) { }
(D) int func(int a, b) { }

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Q. Which of the following is the correct way to declare a reference in C++?

(A) int &ref;
(B) int ref&;
(C) reference int ref;
(D) int ref[];

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Q. What is the purpose of the 'virtual' keyword in C++?

(A) To create a constant variable
(B) To define a static function
(C) To allow function overriding in derived classes
(D) To declare a global variable

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Q. What will be the output of the following code?

int x = 5;
int y = 2;
cout << x % y;

(A) 3
(B) 2
(C) 1
(D) 5

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Q. Which of the following is used to handle dynamic memory allocation in C++?

(A) new and delete
(B) malloc and free
(C) alloc and dealloc
(D) dynamic and free

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Q. Which of the following is the correct way to create an object of a class in C++?

(A) class obj;
(B) obj = new class;
(C) class obj = new class();
(D) ClassName obj;

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Q. Which of the following C++ data types is used to store a single character?

(A) int
(B) char
(C) string
(D) float

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Q. Which of the following is the correct syntax to open a file in C++?

(A) ofstream file('filename.txt');
(B) ofstream file("filename.txt");
(C) ifstream file('filename.txt');
(D) ifstream file("filename.txt");

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Q. Which of the following is the correct way to define a default constructor in C++?

(A) ClassName() {}
(B) void ClassName() {}
(C) ClassName() : { }
(D) void ClassName() : { }

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C++ MCQs with answers Page - 152

Q. Which of the following is the correct way to initialize a string in C++?

Q. Which of the following is the correct way to define a function that returns an integer and takes two integers as parameters?

Q. Which of the following is the correct way to declare a reference in C++?

Q. What is the purpose of the 'virtual' keyword in C++?

Q. What will be the output of the following code? int x = 5; int y = 2; cout << x % y;

Q. Which of the following is used to handle dynamic memory allocation in C++?

Q. Which of the following is the correct way to create an object of a class in C++?

Q. Which of the following C++ data types is used to store a single character?

Q. Which of the following is the correct syntax to open a file in C++?

Q. Which of the following is the correct way to define a default constructor in C++?

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Q. What will be the output of the following code?

int x = 5;
int y = 2;
cout << x % y;