11. Write a menu based script which displays the following options :

Accept roll number, name, marks in sub1, sub2 and sub3. Calculate total, percentage, grade & class and enter the record in a file student. The marks are out of 100 in each subject. Allow the user to enter any number of records.

Grade is found out as follows :

Percentage Grade

< 35 Fail

>= 35 & < 50 Third

>= 50 & < 60 Second

>= 60 & < 75 First

>= 75 Distn

If the student secures < 35 in any one of the subjects, then class = fail. Otherwise class=pass.