Assignment 8 · Score Ledger — Structs, Files, Synthesis

Modules 13–15 (L27–L30) · 40 marks · due end of Week 15 Outcomes: CLO-7, CLO-8 (PF-13.x–PF-15.x)

The capstone assignment: read a ledger file of scores, compute a report, and write a clean output file. Uses struct, std::vector, and file streams.

Input file format (ledger.txt, redirected or default name)

Each line: name score — name is one word; score is an integer 0..100. Lines may be: blank, malformed (wrong field count, non-numeric, out-of-range), or valid. Example:

Ayesha 88
Ben 72

Cara 95
Dan abc
Eve 101

Behavior

1. Open ledger.txt; on open failure print cannot open ledger.txt and exit 2.
2. Parse line by line (getline + istringstream). Valid records go into std::vector<Score> where struct Score { std::string name; int value; };
3. Print a summary to stdout:

loaded : 3
skipped: 2
mean   : 85.00
best   : Cara

(best = highest score; ties → first in file order; skipped = every non-valid line including blanks; mean over loaded records with 2 decimals)

1. Append the same summary to report.txt (create if missing).
2. Exit 0 in all cases except the open failure (exit 2). A file of only bad lines is not an error: loaded 0 with mean/best printed as n/a.

Constraints

• No raw new/delete — std::vector only (the course default).
• struct Score must be defined at file scope; helper functions take const std::vector<Score>&.
• Bad-line detection: extraction failure OR out-of-range OR wrong field count — all are "skipped", no crash, no early exit.
• If report.txt cannot be opened for append, print cannot write report.txt and exit 2 (after the stdout summary).

Deliverables

ledger.cpp (contract, zero warnings) · ledger.txt sample (your own, ≥ 6 lines covering all line classes) · test_table.md — missing file, empty file, only-bad file, tie for best, 100-record file, malformed mid-file · postmortem.md (10 marks).

Notes

• loaded counts records, not lines.
• best prints the name; mean prints before it in the exact order shown.