fopen modes

Question 1

‘r’

Answer 1

Read from file start.
Open for reading only; place the file pointer at the beginning of the file. Return FALSE if the file doesn’t already exist.

Question 2

‘r+’

Answer 2

Read from file start and allow writing.
Open for reading and writing; place the file pointer at the beginning of the file. Return FALSE if the file doesn’t already exist.

Question 3

‘w’

Answer 3

Write from file start and truncate file.
Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file doesn’t exist, attempt to create it.

Question 4

‘w+’

Answer 4

Write from file start, truncate file, and allow reading.
Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file doesn’t exist, attempt to create it.

Question 5

‘a’

Answer 5

Append to file end.

Open for writing only; place the file pointer at the end of the file. If the file doesn’t exist, attempt to create it.

Question 6

‘a+’

Answer 6

Append to file end and allow reading.
Open for reading and writing; place the file pointer at the end of the file. If the file doesn’t exist, attempt to create it.