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code complete (controlling loops (rules (初始化代码紧紧放到循环前面, 努力将循环造成黑盒子，就是说离开 …

- - - - start
      - end
        
        in the loop end to check
        
        do while
    - - use normal exit condition
        
        用 if 语句来退出 in loop
        
        尽量把退出条件写在一起，这样维护比较简单
      - abnormal
        
        use goto to do half loop.