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Unit2

Unit1

Unit2

Objected Oriented Programming

• original computers couldn’t understand modern programming language
  • used machine language, not meant for humans to understand, meant to tell computer what to do
• programming languages are made for humans
• first programming language was assembly language, example below

• example code breakdown: d=255; for(int i =0; i<d; i++){d–;}

• assembler takes assembly language and converts it to machine language

Ex:

• expression from assembly language corresponds to a symbol in machine language, easy conversion
• assembly language referred to as low level programming language, because close to computer
• people wanted languages further away from computer, deals with ideas humans more familiar with
• Fortran example:

• self explanatory code

• programming language designed with a purpose
  • general purpose language used to solve wide variety of problems
  • other program languages designed to solve specific problems
• Fortran originally designed to help people in math and science
  • commonly used by astronomers
• COBOL used for data processing, Ex:

• used in business, specific purpose
• many languages because many ways to solve a problem
  • another reason is that people seek to improve programming languages
    • ex: java, came from c++
• object oriented programming
  • like using a cellphone
    • don’t know how cellphone works, but know how to use cellphone
    • don’t need to know how it works
  • like using a microwave
    • don’t know specifics of microwave
    • just know how to use it
• programmers realized we live object oriented
  • don’t know the specifics, but know how to use stuff
• objected oriented programming requires classes to create objects
• java example with cellphone:

• just need to pass in required data to object in order to use
• object oriented programming useful in collaboration
  • allows concurrent development

Unit1

Primitive Data Types in Java

• In Java, there are 8 primitive data types
• First will focus on the difference between doubles and integers
• Trying to store the values added together in sum as an int would result in an error because data can be lost in that calculation.
• Take in information, manipulate it, and output new information (point of code)
• Strings are NOT primitive data types