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Programming Logic and Design Fourth Edition, Introductory[编程逻辑设计第四版,介绍](PPT-47)文档
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Programming Logic and Design, Introductory, Fourth Edition * Performing End-of-Job Tasks End-of-job tasks may include: Printing summaries or grand totals Printing “End of Report” message Closing any open files Footer line (or footer): end-of-job message line Programming Logic and Design, Introductory, Fourth Edition * Performing End-of-Job Tasks (continued) Programming Logic and Design, Introductory, Fourth Edition * Performing End-of-Job Tasks (continued) Programming Logic and Design, Introductory, Fourth Edition * Performing End-of-Job Tasks (continued) Programming Logic and Design, Introductory, Fourth Edition * Understanding the Need for Good Program Design Good design is: Critical for very large programs Needed to guarantee that components work together properly Well-designed program modules should work: As stand-alone modules As part of larger systems Programming Logic and Design, Introductory, Fourth Edition * Storing Program Components in Separate Files Large programs may contain hundreds of variables and thousands of lines of code Manage lengthy programs by breaking into modules Many languages allow program components to be stored in separate files Storing components separately simplifies reuse Accessing modules from separate files is done with a statement like include, import, or copy Programming Logic and Design, Introductory, Fourth Edition * Storing Program Components in Separate Files (continued) Programming Logic and Design, Introductory, Fourth Edition * Storing Program Components in Separate Files (continued) Advantages of storing components separately: Simplifies reuse Can be provided in compiled form only, to hide details Implementation hiding: hiding details of how a program or module works Programming Logic and Design, Introductory, Fourth Edition * Selecting Variable and Module Names Using meaningful names: Improves code readability Is a form of self-documenting the program Use
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