Answer / manoj

Mode Type of file Read Write Create Truncate
"r" text yes no no no
"rb" binary yes no no no
"r+" text yes yes no no
"r+b" binary yes yes no no
"rb+" binary yes yes no no
"w" text no yes yes yes
"wb" binary no yes yes yes
"w+" text yes yes yes yes
"w+b" binary yes yes yes yes
"wb+" binary yes yes yes yes
"a" text no yes yes no
"ab" binary no yes yes no
"a+" text yes yes yes no
"a+b" binary no yes yes no
"ab+" binary no yes yes no

Answer / abdur rab

When a file is opened with update mode ( '+' as the second
or third character in the mode argument), both input and
output may be performed on the associated stream. However,
writes cannot be followed by reads without an intervening
call to fflush or to a file positioning function (fseek,
fsetpos, or rewind), and reads cannot be followed by writes
without an intervening call to a file positioning function.
Since the file position is altered after read or write.

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