Free Test File modes and error h... – C++ Lan...

Q1: Which file mode is used to open a file for reading only?

A. ios::in B. ios::out C. ios::app D. ios::trunc

Q2: Which file mode opens a file for writing only?

A. ios::in B. ios::out C. ios::app D. ios::binary

Q3: Which mode appends data at the end of the file?

A. ios::in B. ios::out C. ios::app D. ios::trunc

Q4: What does ios::trunc mode do?

A. Truncates file to zero length on open B. Reads data only C. Appends data D. Reads and writes

Q5: Which mode combination opens file for both input and output?

A. ios::in | ios::out B. ios::in | ios::app C. ios::out | ios::trunc D. ios::app | ios::trunc

Q6: What does the fail() function indicate?

A. Successful operation B. An input/output operation failure C. End of file reached D. File opened successfully

Q7: What is checked by the eof() function?

A. File open status B. End of file reached C. File mode D. File size

Q8: Which function clears error flags?

A. clear() B. reset() C. flush() D. close()

Q9: What does the bad() function indicate?

A. Recoverable error B. Non-recoverable error C. End of file D. File is open

Q10: How can you check if a file stream is good for I/O?

A. good() B. fail() C. bad() D. eof()

Q11: What happens if you open a file in ios::out mode and it does not exist?

A. File creation B. Error C. Nothing D. File truncation

Q12: Which mode allows reading and appending?

A. ios::in | ios::app B. ios::out | ios::app C. ios::in | ios::trunc D. ios::out | ios::trunc

Q13: Which method closes an open file?

A. close() B. end() C. stop() D. finish()

Q14: Which of the following is NOT an ios::openmode?

A. ios::app B. ios::close C. ios::trunc D. ios::binary

Q15: How do you prevent truncation while opening a file for output?

A. Use ios::app or ios::out without ios::trunc B. Use ios::in only C. Use ios::binary only D. Use ios::trunc always

Q16: Which flag is needed to open a file in binary mode?

A. ios::binary B. ios::in C. ios::out D. ios::app

Q17: If fail() returns true, what is a common cause?

A. File not found or access denied B. End of file C. File is empty D. File is closed

Q18: Which function returns true if the file stream has no errors?