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.
In C, using pointers to structures can lead to more efficient memory usage because it allows for ________ allocation and deallocation of memory.
- Dynamic
- Heap
- Stack
- Static
Pointers to structures in C enable dynamic allocation and deallocation of memory, as they can be used to allocate memory on the heap, which is not possible with static memory allocation.
Why is it recommended to use pointer arithmetic instead of array indexing for traversal in some cases?
- It ensures type safety and prevents buffer overflows
- It provides faster traversal and better optimization
- It reduces the risk of pointer errors
- It simplifies code and makes it more readable
Using pointer arithmetic for traversal is recommended in some cases because it can result in faster traversal and better optimization, especially in complex data structures. However, it requires careful handling to avoid pointer errors.
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.
In C, ______ is the standard error output stream.
- stdout
- stderror
- stderr
- errorout
The correct option is c) stderr. The standard error output stream is represented by stderr in C.
While reviewing a C program, you come across a scenario where a pointer is freed but later used in the program. What issue could this lead to?
- Buffer Overflow
- Memory Leak
- Null Pointer Exception
- Stack Overflow
Attempting to use a pointer after it has been freed can result in a null pointer exception, causing the program to crash or behave unpredictably.
You are developing a log monitoring tool that needs to constantly read a log file and process new entries. What approach would you take to efficiently read the file?
- Employ multi-threading to parallelize log file reading.
- Periodically restart the application to clear the file buffer.
- Use a polling mechanism to check for file changes.
- Use a single-threaded approach to read the file sequentially.
Efficient log file reading often involves multi-threading to process entries concurrently, leading to better performance.
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.
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.
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.