Lesson·difficulty 1/5·~10 min

Conditionals: letter grades

Conditionals

Decisions in code use if, elif, and else:

python

if temperature > 30:
    advice = "Drink water."
elif temperature > 15:
    advice = "Light jacket."
else:
    advice = "Bundle up."

The first branch whose condition is True runs. elif is short for "else if" and there can be as many as you need. else is optional but catches everything else.

Your task

Write a function grade(score) that takes an integer 0–100 and returns the matching letter grade as a string:

Score range	Returns
≥ 90	`"A"`
80 – 89	`"B"`
70 – 79	`"C"`
60 – 69	`"D"`
anything else	`"F"`

Example:

python

grade(95)  # "A"
grade(72)  # "C"
grade(40)  # "F"

Tests

100 -> A
90 -> A
85 -> B
70 -> C
65 -> D
0 -> F
boundary 89 -> B (hidden)

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