C and C++ Programming MCQ Set Important Questions for Beginners : Bikram Sutradhar

C and C++ Programming Multiple Choice Questions

C Programming and C++ Programming with Fundamentals set by Bikram Sutradhar

1. What is the correct syntax to declare an array of integers with 10 elements in C?
   a) int array[10];
   b) int array(10);
   c) array int[10];
   d) int[10] array;
   Answer: a) int array[10];
2. Which of the following is the correct way to read a string from user input in C?
   a) scanf(“%s”, str);
   b) getline(str);
   c) input(str);
   d) read(str);
   Answer: a) scanf(“%s”, str);
3. What will the following code print? int a=3,b=5;
   printf(“%d”, a > b ? a : b); a) 3
   b) 5
   c) 0
   d) 1
   Answer: b) 5
4. Which function is used to free dynamically allocated memory in C?
   a) freeMemory();
   b) release();
   c) free();
   d) deallocate();
   Answer: c) free();
5. What does the following code do? int x = 10;
   int *ptr = &x;
   *ptr = 20; a) Changes x to 10
   b) Changes ptr to 20
   c) Changes x to 20
   d) Causes a segmentation fault
   Answer: c) Changes x to 20

Section 2: C++ Programming

6. In C++, what keyword is used to inherit a class?
   a) extends
   b) inherits
   c) class
   d) :
   Answer: d) :
7. output of the C++ code? int arr[] = {1, 2, 3};
   cout << arr[1]; a) 1
   b) 2
   c) 3
   d) Compilation error
   Answer: b) 2
8. Which of the following correctly defines a destructor in C++?
   a) ~ClassName();
   b) ClassName();
   c) destroy ClassName;
   d) ClassName::~();
   Answer: a) ~ClassName();
9. What is the purpose of the const keyword in C++?
   a) To declare a constant variable
   b) To define a class
   c) To create a pointer
   d) To overload operators
   Answer: a) To declare a constant variable
10. Which of the following is a feature of Object-Oriented Programming in C++?
    a) Inheritance
    b) Encapsulation
    c) Polymorphism
    d) All of the above
    Answer: d) All of the above

Section 3: General Concepts

11. Which of the following directives is used to include standard libraries in C/C++?
    a) #library
    b) #include
    c) #define
    d) #import
    Answer: b) #include
12. What is the primary purpose of the main() function?
    a) To define classes
    b) To execute the program
    c) To include libraries
    d) To declare variables
    Answer: b) To execute the program
13. In C/C++, which loop is guaranteed to execute at least once?
    a) for loop
    b) while loop
    c) do-while loop
    d) None of the above
    Answer: c) do-while loop
14. Which operator is used for pointer dereferencing in C/C++?
    a) &
    b) *
    c) ->
    d) .
    Answer: b) *
15. output of the code?

for (int i = 1; i <= 3; i++) {
cout << i;
}
a) 012
b) 123
c) 1234
d) 234
Answer: b) 123

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