One-Dimensional Array

1. What is the correct way to declare a one-dimensional array in C?

• A) int arr[10];
• B) int arr();
• C) array int arr[10];
• D) int arr[10] = (0);

2. What will be the output of the following code? int arr[5] = {10, 20, 30, 40, 50}; printf("%d", arr[2]);

• A) 10
• B) 20
• C) 30
• Option 4
• D) 50

3. What is the index of the last element in an array declared as int marks[6];?

• A) 6
• B) 5
• C) 0
• D) 1

4. Identify the error in the following code: int a[3]; a[0] = 5; a[1] = 10; a[3] = 15;

• A) No error
• B) a[3] is out of bounds
• C) Missing return type
• D) Array not initialized

5. What will be the output of this code? int arr[4] = {1, 2}; printf("%d %d %d %d", arr[0], arr[1], arr[2], arr[3]);

• A) 1 2 0 0
• B) 1 2 garbage garbage
• C) 1 2 3 4
• D) Compile time error

6. Which of the following best describes an array in C?

• A) A dynamic collection of variables of different data types
• B) A pointer to a string
• C) A collection of variables of the same data type
• D) A single variable storing a string

7. What will be the output? int arr[3] = {2, 4, 6}; arr[1] = arr[1] + arr[2]; printf("%d", arr[1]);

• A) 10
• B) 6
• C) 8
• D) 12

8. What will happen if you try to access arr[10] in an array int arr[5];?

• A) It returns 0
• B) Segmentation fault or undefined behavior
• C) Compile-time error
• D) It initializes a new value

9. What is the output of the code? int arr[] = {3, 6, 9}; printf("%lu", sizeof(arr)/sizeof(arr[0]));

• A) 3
• B) 4
• C) 12
• D) 9

10. Which statement correctly initializes all elements of an array to zero?

• A) int a[5] = {0};
• B) int a[5] = (0);
• C) int a[5] = [0];
• D) int a[5] = 0;