1. 3/5/2009Computer software1 Introduction Computer System Hardware Software HW Kernel/OS API Application Programs SW

2. 3/5/2009Computer software2 Software/Program Software or program is a set of computer instructions that achieve specific tasks. written in a specific language

3. 3/5/2009Computer software3 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

4. 3/5/2009Computer software4 General-Purpose Programming Languages C : operating system C++ : applications BASIC : easy to learn COBOL : business applications

5. 3/5/2009Computer software5 System Programs Examples Operating Systems Utility programs

6. 3/5/2009Computer software6 Application Programs Examples MS Word Netscape Web Browser MS PowerPoint

7. 3/5/2009Computer software7 SW/Program/Code Source code – text/ASCII Object code - binary Machine code - binary

8. 3/5/2009Computer software8 Compiler & Linker CompilerLinker Source Code Object Code Executable Code Readable by human Executable by machine Machine code Text Other Object Codes

9. 3/5/2009Computer software9 Execution User Kernel/OS Executable Coed 1 2 3

10. 3/5/2009Computer software10 Script Languages Shell Languages JavaScript VB script

11. 3/5/2009Computer software11 Interpreter Translation Execution Line by line No binary code/machine code