c++

Exercise #2: Write a program to do: a) Prompts the user to input three test grades. Each grade is an integer number. b) Prints the three grades one per line in reverse order of input and labeled as Testi, Test2, and Test3. c) Finds the sum of the three tests and their average. d) Prints the sum and average of the three tests. Sample input/output: (The average is supposed to be actually 74.33, so why did we get 74? How to fix it to get an accurate average result?) Enter three grades: 69 7 3 The grades that you entered are: Test3: 81 Test2: 73 Test1: 69 The sum of the grades is: 223 The average grade is: 74 Homework #2: Redo the above Exercise 2 to read the test info (a) from a file "test.txt". Then output the results (b) to a file "grade.txt