- Machine Code
- Assembly Language - assemblers
- COBOL, FORTRAN, BASIC, Lisp
- procedural languages
- Top Down design. We write a series of procedures to solve a problem
- Focus on what do we do, not on the data.
- C, COBOL, ...
- Loops, Selection, ...
- Functional Languages
- Look like mathematics
- LISP
- A collection of functions (+ (- 3 5) 7)
- Logic programming
- Construct a set of rules,
- Ask questions of the rule set.
- Prolog
- Object Oriented Programming
- Build objects that interact with each other
- C++, JAVA, and others
- Software that translates a high level programming language into machine code
- Think of translating a book
- Fortran, Cobol, C, C++ , basic...
- Takes a program as data (called the source code)
- Produces an output file (which is machine code) called a binary or executable
- Will detect syntax errors in the source code
- Example
- A program that inputs a program in a high level language and directs the computer to perform the actions specified in each statement.
- Think of translating a speech as it is going on.
- Logo, lisp, basic
- An interpreted language for kids
- A turtle can be told to walk across the screen
- forward length (fd 100)
- Or to turn an angle (rt 90, lt 90)
- home, go home
- clean, wipe the screen.
- Procedures
to square fd 100 rt 90 fd 100 rt 90 fd 100 rt 90 fd 100 rt 90 end
- Or better yet, we might want to pass in a value, or parameter
to square :len fd :len rt 90 fd :len rt 90 fd :len rt 90 fd :len rt 90 end
- repeat count [command]
repeat 36 [square 100 rt 10]
- ifelse boolean [if part] [else part]
- Perhaps recursion - or a routine calling it's self
- Koch's snowflake.
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