3/5/2002e-business and Information Systems1 Introduction Computer System Hardware Software HW Kernel/OS API Application Programs SW.

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Presentation transcript:

3/5/2002e-business and Information Systems1 Introduction Computer System Hardware Software HW Kernel/OS API Application Programs SW

3/5/2002e-business and Information Systems2 Software/Program Software or program is a set of computer instructions that achieve specific tasks. written in a specific language

3/5/2002e-business and Information Systems3 Programming Language Evolution First Generation Language – machine language Second Generation Language – assembly language Third Generation Language – high level language C C++ BASIC COBOL …….. Programmer friendly

3/5/2002e-business and Information Systems4 Application Programming Languages C : operating system C++ : applications BASIC : easy to learn COBOL : business applications

3/5/2002e-business and Information Systems5 Application Programs Examples MS Word Netscape Web Browser MS PowerPoint

3/5/2002e-business and Information Systems6 SW/Program/Code Source code – text/ASCII Object code - binary Machine code - binary

3/5/2002e-business and Information Systems7 Compiler & Linker CompilerLinker Source Code Object Code Executable Code Readable by human Executable by machine Machine code Text Other Object Codes

3/5/2002e-business and Information Systems8 Execution User Kernel/OS Executable Code 1 2 3

3/5/2002e-business and Information Systems9 Compiling and Linking Errors CompilerLinker Source Code Object Code Executable Code Syntax Errors: Detected by compiler Missing objects: Detected by linker Machine code Text Other Object Codes

3/5/2002e-business and Information Systems10 Execution and Logical Errors User Kernel/OS Executable Code Run-time error: Detected by OS Logical error: Detected by user, tester, or programmer