C语言基础教程课件(英文)ch解析.ppt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * A First Book of ANSI C, Fourth Edition * Algorithms (continued) A First Book of ANSI C, Fourth Edition * Algorithms (continued) Converting an algorithm into a computer program, using a language such as C, is called coding the algorithm The program instructions resulting from coding an algorithm are called program code, or simply code A First Book of ANSI C, Fourth Edition * Algorithms (continued) A First Book of ANSI C, Fourth Edition * The Software Development Process Each field of study has a name for the systematic method used to design solutions to problems In science: called the scientific method In engineering: called the systems approach The technique used by professional software developers for understanding the problem that is being solved and for creating an effective and appropriate software solution is called the software development process A First Book of ANSI C, Fourth Edition * The Software Development Process (continued) A First Book of ANSI C, Fourth Edition * Phase I: Specify the Program’s Requirements Begins with a problem statement or a specific request for a program, which is called a program requirement Suppose you receive an e-mail from your supervisor that says: We need a program to provide information about circles This is not a clearly defined requirement To clarify and define the problem statement, your first step would be to contact your supervisor to define exactly what information is to be produced (its outputs) and what data is to be provided (the inputs) A First Book of ANSI C, Fourth Edition * Phase II: Design and Development Step 1: Analyze the problem. You must understand: The outputs that must be produced The input data required to create the desired outputs The formulas relating the inputs to the outputs Step 2: Select an overall solution algorithm A First Book of ANSI C, Fourth Edition * Phase II: Design and Development (continued) A First Boo