| 9.14 A global variable identifies state. |
| 9.15 A function or functional macro identifies an action. |
| 10.1 (what) Function interfaces describe what is done. |
| 10.2 (what for) Interface comments document the purpose of a function. |
| 10.3 (how) Function code tells how the function is organized. |
| 10.4 (in which manner) Code comments explain the manner in which function details are implemented. |
| 10.5 Separate interface and implementation. |
| 10.6 Document the interface—explain the implementation. |
| 10.7 Document interfaces thoroughly. |
| 10.8 Structure your code in units that have strong semantic connections. |
| 10.9 Implement literally. |
| 10.10 Control flow must be obvious. |
| 10.11 Macros should not change control ... |
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