Implement a program as an abstract data type in C++ that does the following:

1) reads the firstName, lastName and 3 test scores of at least five students.

2) calculate student test score totals, average, letter grade for each student.

3) Display the results in a table format showing firstName, lastName, test1, test2, test3, total, average, letterGrade, of all the students.

3 files .h, .cpp, main.cpp