Tip Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-112

Effect

Computation or source lookup only

Input and validation requirements

A split count of zero produces an undefined tip-per-person result and must be rejected. The round-up branch is also not fully defined by the specification because it does not state whether rounding applies to the total, tip, or another currency increment.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "bill_amount": 27.8,
    "tip_percent": 20,
    "round_up": false,
    "split_count": 2
  },
  "expected_outputs": {
    "tip": 5.56,
    "total": 33.36,
    "tip_per_person": 2.78
  },
  "working": "Convert 20% to 0.20. Tip = 27.80 × 0.20 = 5.56. Total = 27.80 + 5.56 = 33.36. Tip per person = 5.56 ÷ 2 = 2.78."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json