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📜 WAYPOINT LESSON

Checkpoint — Control flow

⭐ beginner⏳ 20 min read📍 Lesson 17 of 85

Guarded computation, classification, and accumulation in one sitting.

Checkpoint: the grade report

Task: implement two methods:

  1. static char Letter(int score) — A for ≥90, B ≥80, C ≥70, D ≥60, F below; throw ArgumentException for scores outside 0–100.
  2. static string Histogram(int[] scores) — one line per letter A..F in that order: the letter, : , then one # per score in that bucket, then \n. Scores out of 0–100 are ignored. Null/empty input yields ""... except the histogram always prints all five lines, so empty input prints the five letters with zero # each.