A certain CS professor gives five-point quizzes that are graded on the scale: 5→A4→B3→C2→D1→E0→E5→A4→B3→C2→D1→E0→ E
Complete a program that accepts a quiz score as an input, and uses decision structures to calculate the corresponding grade. Do this by implementing the functions, below:
num_to_letter(num)
Given a numerical grade between 0 and 5, return the appropriate letter grade.
main()
Write a main() asks the user for a numerical score between 0 and 5, and prints out the letter grade. You must use your num_to_letter function as defined above.
Tip 1: Fractional scores are allowed, e. g. a score of "4.5" is a "B" grade, or "1.7" is an "E". So make appropriate comparisons in your conditions.*
Tip 2: Scores could possibly be less than 0, or greater than 5. Just assign it an ‘E’, or ‘A’ respectively.
Output
For example, if the score of 5 is entered, a letter grade of "A" is returned.
Enter a numerical score (0-5): 5
Grade is A