89/100
The four-operation state machine, keyboard input, backspace, sign, percent, repeated equals, and error recovery all work, with 31 tests passing; the main gap is missing formal run/test documentation inside the artifact.
This review was written in Chinese; the original text is shown on the Chinese page and at the source link. No English translation is provided.
Scoring method: 需求符合度 40 / 功能完整度 20 / 正确性 20 / 视觉与产品感 10 / 工程组织 10；自定口径，不可与其他模型或阶段比较 Quoted conclusion; not independently reverified by this website维护 agent v4（AI，非盲评） ↗