Ask the user if they are taking a class (enter yes or no). If they are not taking a class print

Thanks for using the system. and close the program. If they are taking a class proceed to

ask for a grade as listed below. If the input is not yes or no print Invalid input and close.

This should work regardless of capital or lowercase inputs. Use if / else if / else for this part.

Hint: Force input to lowercase before testing.

If and only if the user is taking a class, ask them to enter a letter grade (A, B, C, D, or F,

uppercase or lowercase). If they enter A or B, print Great Job! If they enter C print Youre

doing alright. If they enter D or F print You can improve. If they enter anything else then

print Invalid grade. Regardless of input then close (including invalid). Use a switch

statement for this portion. Hint: remember cases can spill through until a break and

remember the default case. This should ONLY run if the user is taking a class! (Remember

nesting).