13- file input/ouput

Question 1

stream

Answer 1

is a sequence of data to be read (input stream) or a sequence of data generated by the program to be output (output stream)

Question 2

fail()

Answer 2

returns true if previous stream operation failed
useful to check if file is opened successfully before performing operations on file

Question 3

exit()

Answer 3

exists program immediately.
to use exit, include <cstdlib>
exit() accepts one integer as argument:
convention: 0 - normal program termination; nonzero - abnormal</cstdlib>