Grade from Score

Convert a numeric score into a letter grade with clear thresholds.

conditionals functions integers

Write a function `grade_from_score(score)` that takes an integer score between 0 and 100 (inclusive) and returns the corresponding letter grade as a string, according to the following scale:

- 90 to 100 → "A"
- 80 to 89 → "B"
- 70 to 79 → "C"
- 60 to 69 → "D"
- 0 to 59 → "F"

You may assume the input is always an integer within the given range. The function should return exactly one of the strings "A", "B", "C", "D", or "F".

Constraints

- Input `score` is an integer satisfying 0 <= score <= 100.
- The function should return a string.

Example

>>> grade_from_score(95)
'A'
>>> grade_from_score(84)
'B'
>>> grade_from_score(60)
'D'
>>> grade_from_score(0)
'F'

8 points ~10 min

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Hints

Use if/elif/else to check ranges in order.

Start with the highest grade range and work downward.

Remember that the upper bound of each range is inclusive (e.g., 89 is a B).

Test Results

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