What is the primary purpose of using typedef in C programming?
- Creating a new data type
- Declaring global variables
- Defining variables within a structure using bit fields
- Managing memory allocation
Typedef in C is used for creating aliases or alternative names for existing data types. It simplifies code, improves code readability, and enhances portability by allowing you to use more meaningful names for data types.
For efficient memory utilization in dynamic arrays, it is important to release the allocated memory using the function _________.
- free()
- malloc()
- realloc()
- calloc()
The correct option is 'free()'. It is essential to use the free() function to release dynamically allocated memory to avoid memory leaks.
The ________ algorithm is known for its simplicity but is inefficient for sorting large datasets.
- Bubble Sort
- Merge Sort
- Quick Sort
- Selection Sort
The correct option is 'Bubble Sort'. While Bubble Sort is easy to understand, it is not efficient for large datasets due to its O(n^2) time complexity.
An enumeration is a user-defined data type that consists of integral ________.
- Characters
- Functions
- Pointers
- Values
An enumeration is a user-defined data type that consists of integral values, typically used for defining a set of named integer constants.
When opening a file with fopen, what happens if the file does not exist and the mode is set to 'r'?
- It appends data to the existing file.
- It creates a new file.
- It overwrites the file's content.
- It returns a NULL pointer.
When opening a file with fopen in read mode ('r') and the file doesn't exist, it returns a NULL pointer, indicating that the file was not successfully opened.
When passing an array to a function in C, what is actually being passed?
- A pointer to the first element
- The entire array
- The size of the array
- The value of the first element in the array
In C, when passing an array to a function, only a pointer to the first element is passed, allowing the function to access the entire array.
When declaring a string literal in C, which character is automatically appended at the end?
- Exclamation mark '!'
- Null terminator ' '
- Question mark '?'
- Semicolon ';'
In C, a null terminator ' ' is automatically appended at the end of a string literal. This null character indicates the end of the string, allowing C functions to determine the string's length.
What would be the result of trying to access an array with a pointer that has not been initialized?
- It will access a random memory location, leading to undefined behavior.
- The pointer will point to the beginning of the array.
- The program will compile but throw a runtime error.
- The program will not compile.
Accessing an array with an uninitialized pointer in C leads to undefined behavior because the pointer doesn't point to a valid memory location. The result is unpredictable and can lead to crashes or incorrect data manipulation.
What is the main difference between function declaration and function definition in C?
- Declarations contain the function's code
- Declarations specify the function's name
- Definitions declare the function's return type
- Definitions provide the function's implementation
The main difference between function declaration and function definition in C is that declarations specify the function's name and data types, while definitions provide the actual implementation of the function.
When defining a bit field, what does the number after the colon represent?
- Bit order
- Bit position
- Bit size
- Bit value
The number after the colon represents the bit size, indicating how many bits the bit field can occupy.