Question

Write a program that keeps reading a test 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

while True:
    score = float(input("Enter a score (-1 to Exit): "))
    if score == -1:
        break
    if score >= 90:
        letter_grade = 'A'
    elif score >= 80:
        letter_grade = 'B'
    elif score >= 70:
        letter_grade = 'C'
    elif score >= 60:
        letter_grade = 'D'
    else:
        letter_grade = 'F'
    print("The letter grade for that score is {}.\n".format(letter_grade))