Computer Programming

Lasta NAY. Teaching Demo. MSU-IIT IDS. 5/14/2010

Computer ProgrammingNeal Alfie Y. Lasta


Table of ContentsI. What’s it All About?II. From your mind to the computer

processor


Word processingI. What’s it all about?


SlaveI. What’s it all about?


The quick brown fox jumps over the lazy d

I. What’s it all about?


Computer ProgramSet of instructions telling

computer what to do‘code’



Programmer!I. What’s it all about?


Gobs and gobs of codeI. What’s it all about?


Important programmer qualitiesThey know how to break big

problems into smaller step-by-step procedures

They can express these steps in a very precise language.



Computer Programming

Language for writing steps

Java C C++



Visual Basic

COBOL

ISETL



II. From your mind to the computer processor


3 important tools

Compiler VirtualMachine

ApplicationProgrammin

gInterface


CompilerComputers deal with Zeros and

Ones

Start = 01010011 01110100 01100001 01110010 01110100


CompilationTranslated Computer Program

into 0’s and 1’s

Source Code

Object Code


Relationship

Write Source Code

Create Object Code

Special Software tool - Compiler


Relationship

Computer’s hard drive -- > Javac or javac.exe


Virtual Machine

They’re just talking Gibberish! (-:


Computer “thinks” the thoughts

Bytecode file


How Java does it

“Do What it Says to Do in the Bytecode File”


Java Virtual MachineSpecial Software

Computer JVM bytecode


Java Virtual Machine

Run •Java Program in computer

JVM •Java Virtual Machine

Examine •Bytecode, and carries

out instructions


2 ways to run computer program

(a) Computer runs some object code

(b) Computer runs JVM, JVM follows bytecodes instructions


Application Programming Interface1980s

Word processing machines firm

Write

Search-and-replace program

Spell checker program

Another search-and-replace

Another spell checker

A better search-and-replace….


Holy Grail of ProgrammingEasy to reuse software

Searches for single character

Looks for blank spaces

Substitutes one letter for another

+ +

= Search and Replace Program


Adding new feature?Just Reassemble pieces in

different way◦-Sensible◦-Cost Efficient◦- Much more Fun!


Java came along in 19951995 Present

250 programs More than 3000 programs


This library known asApplication Programming

Interface (API)API

Useful

Formidable

- All the things you can do with API programs

- API is so extensive


API DocumentationProgrammers look of API Features in

online document called API Specification

A.k.a API Documentation, or JavadocsDescribes thousands of features in

Java APIDaily basis consultationBookmark website


Java Programming ToolsetJava CompilerJava Virtual MachineJava APIJava API Documentation

Also need: ◦Editor◦A way to issue commands

Compile program Run JVM

Computer Programming

Documents

Transcript of Computer Programming