How does a double pointer differ from a single pointer?

  • Can store multiple values
  • Points to a memory address
  • Points to another pointer
  • Stores double the data
A double pointer in C points to the memory address of a pointer, while a single pointer points to a single memory address. It allows for indirection, which can be useful in certain scenarios.

How does the strtok() function work in C?

  • It calculates the length of a string
  • It converts a string to uppercase
  • It performs a binary search
  • It splits a string into multiple substrings based on a delimiter
The strtok() function in C is used to split a string into multiple substrings based on a specified delimiter. It maintains state between calls, making it useful for tokenizing strings.

What function can be used to find the current position of the file pointer in a file?

  • fseek()
  • readPosition()
  • getCurrentPointer()
  • filePosition()
The correct function to find the current position of the file pointer in a file is 'fseek()'. It allows you to set the file position indicator to a specific location in the file and returns the current position. The other options are not valid functions for this purpose.

You are developing a program to manage the seating arrangement in a movie theater with rows and columns. How would you represent the seats using arrays?

  • 1D Array
  • 2D Array
  • Linked List
  • Queue (FIFO)
Seats in a theater can be efficiently represented using a 2D array, with rows and columns, making it easy to access and manage each seat's status.

How does the 'return' statement affect the flow of control within a loop?

  • The 'return' statement exits the loop, returning control to the calling function or method.
  • The 'return' statement has no impact on the flow of control within a loop.
  • The 'return' statement skips the next iteration of the loop.
  • The 'return' statement terminates the entire program when used within a loop.
The 'return' statement is used to exit a function or method prematurely and return a value. When a 'return' statement is encountered within a loop, it immediately exits the loop and returns control to the calling function or method. This can be useful for ending a loop under certain conditions or returning a value from the loop.

When using dynamic memory allocation for arrays, which standard library function is used to release the memory that was previously reserved?

  • calloc
  • free
  • malloc
  • realloc
The correct function to release dynamically allocated memory is free. It is used to deallocate the memory previously reserved using malloc or calloc.

The function ________ is used to find the first occurrence of a character in a string in C.

  • findchar
  • locatechar
  • strchr
  • searchchar
The correct answer is strchr. strchr is a standard C function used to find the first occurrence of a character in a string. The other options are not valid C functions for this purpose.

What is the primary purpose of the malloc function in C?

  • To allocate memory for a single variable
  • To allocate memory for an array of elements and initialize them
  • To free memory allocated by calloc
  • To reallocate memory for an array
The primary purpose of the malloc function in C is to allocate memory for a single variable. It returns a pointer to the allocated memory, which can be used to store data.

When reading a file in C, which function can be used to check if the end of the file has been reached?

  • fclose()
  • feof()
  • ferror()
  • fseek()
The feof() function is used to check if the end of a file has been reached during file reading operations in C.

The ________ function is used to write data to a file in C.

  • fprintf
  • fread
  • fscanf
  • fwrite
In C, the fwrite function is used to write data to a file. It allows you to write binary data to a file stream.