2. using simple I/O in C++ Requirements 1) Programming language: C++ 2) Development/Running Environment: CLion. The implementation details Write a program that calculates the total grade for N classroom exercises as a percentage and letter grade. The user should input the value for N followed by student scores and maximum possible score for each of the classroom exercise. Your program will calculate total points earned, total points possible, overall percentage, and letter grade. Overall percentage = total points earned 100/ total points possible Letter grade is calculated as follows: Sample input and output are shown as follows: How many exercises to input? 3 Score received for exercise 1: 10 Total points possible for exercise 1: 10 Score received for exercise 2: 7 Total points possible for exercise 2: 12 Score received for exercise 3:5 Total points possible for exercise 3:8 Your total is 22 out of 30 , or 73.33% Your letter grade is: C Test your program with the sample I/O shown above, take a screen shot of the output screen and include it with your homework submission. Error Checking Your program will check for the following errors and will display appropriate error message: 1. Number of exercises must be greater than 0 . 2. Score received for an exercise and total points possible for an exercise must be positive. 3. Score received for an exercise must be less than or equal to total points possible for an exercise. Make sure to add a block of comments at the top of all your files as follows