James Tam A High-Level Model For Software Development What is involved in the process of designing, writing and maintaining computer programs?

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Presentation transcript:

James Tam A High-Level Model For Software Development What is involved in the process of designing, writing and maintaining computer programs?

James Tam What Is Computer Science? Review: Solving problems with the computer

James Tam Limitation: The Computer Is Not Very "Smart" My taxes returns are being audited. Help me! I don't understand.

James Tam The Computer Must Be Told Exactly What To Do Print my 1999 tax return. Print my 2000 tax return. : : : : Software: The instructions that tell the computer what to do to.

James Tam A Model For Creating Computer Software Specify the problem Develop a design Implement the design Maintain the design

James Tam Specifying The Problem Determining what problem will be solved by the software Bringing up important issues

James Tam Develop A High-Level Design How to solve this problem? (algorithm) Check the algorithm Can be specified through flowcharts and pseudo-code (next section of notes)

James Tam Developing An Algorithm: Top-Down Approach General approach Approach to part of problem Specific steps Approach to part of problem Abstract Particular Top Bottom Figure extracted from Computer Science Illuminated by Dale N. and Lewis J.

James Tam Top Down Approach: A Real Life Example Invite the people Prepare the food Make a list Call the people Plan the menu Shop for food Cook the food Write down names Check list Edit list Get phone numbers While more to call Call Mark list Get cook books Look for ideas Decide on food Invite the people Prepare the food Make a list Call the people Plan menu

James Tam Implement The Design Translating the high level to design to an actual programming language (e.g., Pascal) Test the program design Balance of this course (and the next course, CPSC 233)

James Tam Maintaining The Design Modify the program according to changing needs and problems that have been found Some in CPSC 233 (more in CPSC 333)

James Tam Why Bother With Computers: Speed Start! Done! Did we start yet?

James Tam Why Bother With Computers: Repetition Repetition …999, 1000, 1001, 13… Repeat a billion times No problemo!

James Tam Why Bother With Computers: Repetition Repetition Oops!

James Tam Why Bother With People? Creativity Intelligence

James Tam Summary What are the major steps involved in creating software Specification Design Implementation Maintenance What are the strengths of computers vs. people