MIL-003 Console interface
Metadata
Version History
| Date |
Status |
Author |
Reviewer |
Change |
Commit |
| 2026-10-04 |
Accepted |
Jens Tirsvad Nielsen |
S01 |
Initial version |
8ccefff |
Purpose
Decide whether the interactive calculator behaves as the lecture describes, including continuing with the result and restarting by recursion.
Deliverable
src/calc/calculator.py and src/calc/__main__.py with the ASCII title and calculator, input handling and the recursive restart, plus tests/test_calculator.py.
Go / No-Go Criteria
| # |
Criterion (objectively checkable) |
Go |
No-Go |
| 1 |
The program asks for a number, an operation and a second number |
Met |
Not met |
| 2 |
Answer y continues with the previous result, n starts a new calculation by calling calculator() again, q quits |
Met |
Not met |
| 3 |
Invalid numbers, operations and answers are re-prompted; division by zero restarts the calculator |
Met |
Not met |
| 4 |
ASCII title and ASCII calculator are shown at start |
Met |
Not met |
| 5 |
python -m calc runs and the tests pass |
Met |
Not met |
Dependencies
| Depends on |
Reason |
| MIL-002 |
Uses the operations dictionary and constants |
Traceability
| Business Case objective / KPI / user story |
Reference |
| Objectives 1 to 4 |
BC-001 |
Ownership
| Role |
Stakeholder ID (SA) |
| Owner |
S01 |
| Approving reviewer |
S01 |
Target Date
2026-10-07
Tasks
| # |
Task |
Summary |
Needs its own Use Case/User Story? |
Reference |
| 1 |
Implement the calculator loop with recursive restart |
calculator() reads the numbers and operation, looks the function up in OPERATIONS, and lets the user continue with the result or call calculator() again for a new calculation. |
No |
|
| 2 |
Add ASCII title and ASCII calculator |
Show the ASCII title and an ASCII calculator when the program starts, taken from constants.py. |
No |
|
| 3 |
Handle invalid input and division by zero |
Re-prompt on non-numeric input, unknown operations and unknown answers; print a message and restart on division by zero. |
No |
|
| 4 |
Add interface tests |
pytest tests that feed input() through monkeypatch and check the printed results, the continue and new paths, re-prompts and the ASCII art. |
No |
|
