Software Development Programming & Languages. Programming: A Five-Step Procedure Define the problem Design a solution Code the program Test the program.

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Presentation transcript:

Software Development Programming & Languages

Programming: A Five-Step Procedure Define the problem Design a solution Code the program Test the program Document the program

Five Generations of Programming Languages Machine Languages, Assembly Languages, 1950s-- High-Level Languages, 1960s--, FORTRAN, COBOL, BASIC, Pascal, C, PRG Very-High-Level Languages (4GL), 1970s-- PRG III, SQL, Intellect, NOMAD, FOCUS Natural Languages, 1980s--

Language Translators An assembler is a program that translates the assembly- language program into machine language. A compiler is a language translator that converts the entire program of a high-level language into machine language before computer executes the program. An interpreter is a language translator that converts each high- level language statement into machine language and executes it immediately, statement by statement.

Object-Oriented Programming Object-oriented programming (OOP) is a programming method that combines data and instructions for processing that data (called methods ) into a self-sufficient “object” that can be used in other programs. It involves three important concepts: Encapsulation: Encapsulation means an object contains (encapsulates) both data and the instructions for processing it. Inheritance: Inheritance allows traits of a class of objects to be inherited by its subclass. Polymorphism: Polymorphism allows a message to produce different results based on the object that it sent to. (A message is a call of some method).

Visual Programming Visual programming is a method of creating programs in which the programmer makes connections between objects by drawing, pointing, and clicking on diagrams and icons.

Internet Programming HTML (HyperText Markup Language) is a type of programming language that embeds simple commands within standard ASCII text documents to provide an integrated, two-dimensional display of text, graphics, and sounds. VRML (Virtual Reality Markup Language) is a type of programming language used to create three-dimensional Web-pages. Java (developed by Sun Microsystems) is a programming language that allows users to create applications (called Applets ) that can be downloaded and executed on the remote host via the internet connection.