basic loop written.
example output
Input a mark: 1
Input a mark: 2
Input a mark: 3
Input a mark: -1
There are 3 students
Get grammar correct is vs are, student vs students
Example output
$ java E02DoWhile
Input a mark: 1
Input a mark: -1
There is 1 student:
$ java E02DoWhile
Input a mark: 1
Input a mark: 2
Input a mark: 3
Input a mark: -1
There are 3 students:
$ java E02DoWhile
Input a mark: -1
There are 0 students:
works & produces desired output for example input
$ java E02DoWhile
Input a mark: 13
Input a mark: 45
Input a mark: 63
Input a mark: 73
Input a mark: 101
Input a mark: 45
Input a mark: 18
Input a mark: 92
Input a mark: -1
There are 7 students: 2 distinctions, 1 pass, 4 fails (plus 1 invalid)