Arrays and Strings – Multiple Choice Questions (MCQs)

1. 13. What is the size of the array 'arr' declared as `int arr[10];` (assuming int size is 4 bytes)?

   • A. 10 bytes
   • B. 20 bytes
   • C. 40 bytes
   • D. 80 bytes

2. 14. What happens if you try to access an array element with an index out of bounds in C?

   • A. It will result in a compilation error
   • B. It will return 0
   • C. It might lead to undefined behavior
   • D. It will automatically resize the array

3. 15. Can you initialize an array without specifying its size if you provide the initial values?

   • A. Yes
   • B. No
   • C. Only for character arrays
   • D. Only for integer arrays

4. 16. What is a multi-dimensional array in C?

   • A. An array of pointers
   • B. An array where elements can be of different data types
   • C. An array of arrays
   • D. A special type of string

5. 17. What is an array of strings in C?

   • A. A single string with multiple lines
   • B. A 2D character array
   • C. An array of character pointers
   • D. Both B and C

6. 18. How do you declare an array of 5 strings, each with a maximum length of 20, in C?

   • A. char str[5][20];
   • B. string str[5][20];
   • C. char *str[5];
   • D. char str[20][5];

7. 19. What is the purpose of the `gets()` function in C?

   • A. To get an integer input
   • B. To get a character input
   • C. To get a string input (though unsafe)
   • D. To print a string

8. 20. Why is `gets()` considered unsafe to use?

   • A. It can lead to buffer overflows
   • B. It is slow
   • C. It cannot read strings with spaces
   • D. It is not available in all compilers

9. 21. Which safer alternative is often used instead of `gets()` to read a string in C?

   • A. scanf()
   • B. printf()
   • C. fgets()
   • D. puts()

10. 22. What does the `sizeof()` operator return when used with an array?

    • A. The number of elements in the array
    • B. The size of the first element
    • C. The total size of the array in bytes
    • D. The index of the last element

11. 23. What does the `sizeof()` operator return when used with a string literal (e.g., `sizeof(\Hello\")`)?"""

    • A. The length of the string
    • B. The length of the string + 1 (for null terminator)
    • C. The size of a character pointer
    • D. 5

12. 24. Can you compare two strings directly using the '==' operator in C?

    • A. Yes
    • B. No
    • C. Only if they are of the same length
    • D. Only if they are string literals