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.

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.

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.

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.

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.

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.