四则运算编程
PSP记录个人项目耗时情况
| PSP | Personal Software Process Stages | Time(%) |
| Planning | 计划 | 10 |
| Estimate | 估计这个任务需要多少时间 | 15 |
| Development | 开发 | 70 |
| Analysis | 需求分析 | 5 |
| Design Spec | 生成设计文档 | 4 |
| Design Review | 设计复审 | 4 |
| Coding Standard | 代码规范 | 2 |
| Design | 具体设计 | 10 |
| Coding | 具体编码 | 35 |
| Code Review | 代码复审 | 5 |
| Test | 测试 | 5 |
| Reporting | 报告 | 8 |
| Test Report | 测试报告 | 3 |
| Size Measurement | 计算工作量 | 1 |
| Postmortem&Process Improvement Plan | 事后总结，并提出过程改进计划 | 4 |