CHAPTER 14 PROGRAMMING AND LANGUAGES Mc GrawHill Technology

CHAPTER 14 PROGRAMMING AND LANGUAGES Mc. Graw-Hill Technology Education © 2006 by the Mc. Graw-Hill Companies, Inc. All rights reserved.

Competencies (Page 1 of 2) Describe the six steps of programming Discuss design tools including top-down design, pseudocode, flowcharts, and logic structures Describe program testing and the tools for finding and removing errors Page 396 2

Competencies (Page 2 of 2) Describe CASE tools and object-oriented software development Explain the five generations of programming languages Page 396 3

Programs and Programming What is a Program? A problem-solving procedure A list of instructions Prewritten Custom-written Application software System software Page 398 4

What is Programming? Programming is software development Six step procedure Program specification Program design Program code Program test Program documentation Program maintenance Page 398 5

Step 1 Program Specifications Page 399 6

Input and Output Plans End user sketches of desired output to help determine needed input to meet objective Page 400 7

Step 2 Program Design Plan a solution Use structured programming techniques Top-down program design Pseudocode Flowcharts Logic structures Documentation Page 401 8

Step 3 Program Code Writing the program or coding The good program Reliable Well documented Understandable to other programmers Structured programs best method Use the most appropriate computer language Page 406 13

Step 4 Program Test Debugging Testing Eliminating errors Syntax errors Logic errors Testing processing Identified Syntax error Page 410 14

Step 5 Documentation Written descriptions and procedures about a program Important for people who will use the program Users Operators Programmers Page 410 15

Step 6 Program Maintenance 75% of total lifetime cost Error-free operations Effective program Two categories Operations Changing needs Page 412 16

CASE Tools Computer-aided software engineering (CASE) Automate development process Designing Coding Testing activities Page 413 17

Object-Oriented Software Development Focuses less on procedures, more on relationship between objects OOP: Object-oriented programming Object contains both the data and the processing operations Page 414 18

Generations of Programming Languages (Page 1 of 2) Occurring in “generations” or “levels” Levels-Machine languages to natural languages There are five generations : Lower level closer to machine language Higher level closer to human-like language Page 414 19

Generations of Languages (Page 2 of 2) 1 st -- Machine languages 2 nd -- Assembly languages 3 rd -- High level procedural languages (3 GL) 4 th -- Problem-Oriented languages (4 GL) 5 th -- Natural Languages & Visual programming languages(5 GL) Page 415 20

A Look to the Future MI-Tech Synapse Solutions has created a system called MI-tech Understands word order and meaning Computer translates "wish list" into machine language Page 418 21

Discussion Questions (Page 1 of 2) Identify and discuss each of the six steps of programming. Describe CASE tools and OOP. How does CASE assist programmers? What is meant by “generation” in reference to programming languages? What is the difference between low-level and high-level languages? Page 427 22

Discussion Questions (Page 2 of 2) What is the difference between a compiler and an interpreter? What are logic structures? Describe the differences between the three logic types. Page 427 23