Write а C++ prоgrаm tо reаd the data frоm the file grades.txt and then calculate the average grade and letter grade for each student. Then, write the results to the screen and to a new file called results.txt. For determining letter grades, use the scale: average grade >= 90% ----> A average grade >= 80% ----> B average grade >= 70% ----> C average grade >= 60% ----> D average grade < 60% ----> F Assume that each line in the input file contains a student name followed by four integer values representing their grades. This is a sample grades.txt file. Alice 95 88 92 54Bob 75 81 67 41Charlie 89 93 87 41 In the file above, there can be any number of lines. Sample Output: Alice 82.25 B Bob 66 D Charlie 77.5 C Your program should compile and run. Add enough comments and make sure your program is correctly indented.
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