Quiz for Random file access rewind

Q1: What does the rewind() function do?

A. Moves the file pointer to the beginning of the file B. Moves the file pointer to the end of the file C. Closes the file D. Opens the file

Q2: Which header file is required to use rewind()?

A. <stdio.h> B. <stdlib.h> C. <string.h> D. <fcntl.h>

Q3: What is the return type of rewind()?

A. void B. int C. long D. FILE*

Q4: Can rewind() fail and return an error?

A. No, rewind() returns void and does not report errors B. Yes, returns -1 on failure C. Yes, returns EOF on failure D. Yes, returns NULL on failure

Q5: Which function can be considered equivalent to rewind(fp)?

A. fseek(fp, 0, SEEK_SET) B. fseek(fp, 0, SEEK_END) C. ftell(fp) D. fclose(fp)

Q6: What happens if you call rewind() on a file opened in write-only mode?

A. File pointer moves to start, but behavior may vary B. Causes program to crash C. Does nothing D. Closes the file

Q7: Which of these statements is TRUE about rewind()?

A. It resets error and EOF indicators for the file stream B. It reads data from the file C. It writes data to the file D. It closes the file

Q8: After calling rewind(fp), ftell(fp) will return:

A. 0 B. -1 C. EOF D. Position of last read

Q9: Which function moves the file pointer without resetting error indicators?

A. fseek() B. rewind() C. ftell() D. fclose()

Q10: Can rewind() be used on binary files?

A. Yes B. No C. Only text files D. Only in append mode

Q11: What is the main difference between rewind() and fseek()?

A. rewind() resets error indicators, fseek() does not B. fseek() resets error indicators, rewind() does not C. No difference D. rewind() closes the file, fseek() moves pointer

Q12: Which function is more portable across platforms for setting file pointer to start?

A. rewind() B. fseek(fp, 0, SEEK_SET) C. both equally portable D. none

Q13: Is it necessary to call rewind() before reading a file after writing to it?

A. Yes, to reset pointer and clear error indicators B. No, not necessary C. Only if file is opened in append mode D. Only on Windows

Q14: What will happen if rewind() is called on a closed file pointer?

A. Undefined behavior or crash B. Nothing C. Returns error code D. Prints error message

Q15: Which of the following is NOT true about rewind()?

A. Returns a status code B. Moves pointer to start C. Clears error and EOF indicators D. Declared in stdio.h

Q16: Can rewind() be used in place of fseek() for setting arbitrary positions?

A. No, rewind() only sets to beginning B. Yes, rewind() sets any position C. Yes, but inefficient D. No, rewinds then fseek required

Q17: If a file is opened in read mode, what does rewind() do?

A. Moves file pointer to beginning for reading B. Closes the file C. Reads first line D. Throws error

Q18: Is rewind() a blocking or non-blocking function?

A. Non-blocking B. Blocking C. Depends on file size D. Depends on OS

Q19: Which standard C library defines rewind()?

A. C89/C90 standard B. C99 only C. C11 only D. POSIX only