C++ OBJECT ORENTED PROGRAMING

Please can some one help me with this program

using functions, arrays, if statement and loops to develop a c++ source files that will be called CLASS LIST . this program should allow user to enter their names, student identification number and exam marks, a function should be created to convert the marks into grades and function should be created to display the student name, id numbers and grades on the same line. the class list should have a length on 20 student

A = 75 and above
B = 66 TO 74
C = 50 TO 64
D = 40 TO 49
E = 25 TO 39
F = 0 TO 24