# File:    extraCredit.py
# Author:  Dr. Gibson
# Date:    2/21/2018
# Section: N/A
# E-mail:  k.gibson@umbc.edu 
# Description:
#   This file contains python code that asks the user for a
#   grade, checking its validity (dependent on extra credit).

ALLOWED = "yes"   # input for extra credit being allowed

def main():

    # set up the boolean flag
    gradeValid = False

    # this will evaluate to True as long as the grade is invalid
    while not gradeValid:
        # use concatentation to make it one string; use the \ at the
        # end of each line to allow it to continue to the next line
        extraC = input("Is extra credit allowed? Enter 'yes' for allowed: ")
        grade  = int(input("What is your score? "))

        # grade is between 0 and 100 (inclusive)
        if grade >= 0 and grade <= 100:
            gradeValid = True

        # grade is at least zero, and extra credit is allowed
        elif grade >= 0 and extraC == ALLOWED:
            gradeValid = True

        # if neither of these was true, gradeValid will remain False
        # and the while loop will run again, asking for new info

    # exited the while loop, so print out the student's grade
    print("Congrats on getting a", grade)

    if extraC == ALLOWED:
        print("It's cool you're allowed to earn extra credit.")


main()