Create a program to ask user entering a test score and display the grade and a comment for it.

The scare of grades is followed:

100-90 A,  Excellent, 
89-80 B, Superior,   
79-70 C, Average,
69-60 D,  Poor,
below 60 F   Try again.

You are required to use nested if/else statement to assign a grade to a memory  box.
However, you have to use a switch statement to print results for this exercise.

Your screen should look like the following: