You're working on a C program that needs to manipulate and process data about a list of products in a store. Each product has several attributes like name, price, and quantity. What approach would you take to store and process this data efficiently?
- 2D Array
- Array of Structures
- Singly Linked List
- Vector
An array of structures would be an efficient approach for storing and processing data about products in a store. This data structure allows you to create a custom data type that contains all the attributes of each product (name, price, quantity), making it easy to manage and process product information efficiently.
You are working on an application that processes large datasets. How can using pointers and arrays together optimize the application?
- Enhance data security
- Improve data access speed
- Reduce memory usage
- Simplify user interface
Using pointers in conjunction with arrays can optimize an application by improving data access speed. Pointers can efficiently traverse and manipulate arrays, leading to faster data retrieval and processing, which is crucial when working with large datasets. This optimization benefits the application's performance.
The members of a structure are accessed using the ________ operator.
- -> (arrow)
- . (dot)
- :: (scope)
- [] (brackets)
In C, members of a structure are accessed using the dot (.) operator.
You're tasked with optimizing a program that reads large text files. What strategies could you employ to improve the performance of the file reading operation?
- Employ memory-mapped files to reduce I/O operations.
- Ignore error handling to reduce overhead.
- Read the entire file into memory at once.
- Use a simple sequential read operation without any optimizations.
Utilizing memory-mapped files can reduce I/O operations and improve the performance of reading large text files. Loading the entire file into memory can lead to resource issues.
Double pointers are often used in C to create a(n) ________ of pointers.
- Array
- Array of Pointers
- List
- Structure
Double pointers in C are often used to create an array of pointers, allowing you to work with multiple pointers efficiently.
What is the lifetime of a static variable in a C program?
- Limited to the function it's defined in
- Same as the program's runtime
- Until the function exits
- Until the program exits
The lifetime of a static variable in C is the same as the program's runtime. It retains its value between function calls and persists until the program terminates.
In a C program, you notice that data written to a file is not immediately visible on the disk. What could be a reason for this delay?
- Buffering
- File format mismatch
- File permissions issue
- Insufficient disk space
Buffering is a common reason for a delay in writing data to a file in C. The system may buffer data before writing it to disk for efficiency. This buffering can cause a delay in making the data visible on the disk.
In C, function pointers are useful when you want to choose at runtime which ________ to execute.
- Data structure
- Function or behavior
- Memory allocation
- Variable
Function pointers in C allow you to select and call functions dynamically at runtime based on the desired behavior, enhancing the flexibility of your code.
Consider a scenario where a program needs to store a character read from a file. Which data type would be appropriate for this?
- char
- double
- float
- int
To store a character read from a file in C, the appropriate data type is 'char' as it can represent individual characters effectively.
Failing to release a memory block with ________ before the program terminates can result in a memory leak.
- calloc()
- free()
- malloc()
- realloc()
Failing to release memory with the "free()" function in C can result in a memory leak, where the allocated memory is not properly deallocated, causing the program to consume more memory than necessary.
A pointer to a function in C is declared using the syntax ________.
- *func_ptr
- func()ptr
- func_ptr()
- ptr_func
In C, to declare a pointer to a function, you use the syntax "return_type (*pointer_name)(arguments)." This allows you to call a function through the pointer.
You're developing a program that needs to frequently update specific records in a large binary file. Which file handling functions would be most useful to efficiently locate and update records?
- fseek() and fwrite()
- fread() and ftell()
- fprintf() and fscanf()
- fgetc() and fputc()
To efficiently locate and update records in a binary file, you would use fseek() to move to the desired position and fwrite() to write the updated data. The other options are not suitable for this specific task.