Using the following table as a guide, write a program that asks the user to enter an integer test score between 0 and 100. The program should display the appropriate letter grade. The program should display an error message if the test score is <0 or >100.
90 to 100 85 to 89 80 to 84 75 to 79 70 to 74 65 to 70 60 to 64 55 to 59 0 to 54
A+ A B+ B C+ C D+ D F