Question

PYTHON ONLY!!

PLEASE PUT COMMENTS EXPLAINING THE CODE.

Write a program that keeps reading an exam score until a -1 is entered. The program will output the letter grade according to the table below:

Score    Grade
90-100     A
80-89       B
70-79       C
60-69       D
< 60         F

For example:
Enter a Score (-1 to Exit): 92
The Letter grade for that score is A.

Enter a Score (-1 to Exit): -1

Answer 1

# Method to get letter grade from score
def letterGrade(score):
    if score < 60:
        letter = 'F'
    elif score < 70:
        letter = 'D'
    elif score < 80:
        letter = 'C'
    elif score < 90:
        letter = 'B'
    else:
        letter = 'A'
    return letter

def main():
    # Reading input
    score = int(input("Enter a Score (-1 to Exit): "))
    # Checking sentinel value
    while score!=-1:
        # Printing result
        print("The Letter grade for that score is",letterGrade(score)+str("."))
        # Reading input
        score = int(input("Enter a Score (-1 to Exit): "))

main()