Programming

Programming

1. control flow

   • sequencing
     • The order through an algorithm
   • selection
     • IF THEN ELSE
   • loops
     • WHILE OR FOR

2. translation

   • Interpreter
     • Executes the source code directly
     • used when creating a program
     • would be used on open source software
   • Assembler
     • Turns assembly language into machine code
     • only can be used in low level programming
   • compiler
     • Creates an executable file to run the program
     • once it is compiled it doesn't need the original source code.
     • would be used in proprietary software

3. high level and low level programming

   • high level has to be translated
     • uses language that is easier to understand by humans
     • has to be translated
     • eg python, BASIC Javascript

4. Algorithms

   • Solving problems i step at a time.
   • Processors can only process 1 instruction at a time
   • make sure you know the symbols
   • Mainly expressed as a flowchart

5. data types

   • operations are mathematical symbols eg +
   • variable changes during the program eg score in a game
   • variable or constant
     • constant stays the same eg pi
   • integers and real numbers
     • integer is a whole number
     • Real(sometimes called floats) can have decimal places

6. pseudocode

   • used for planning algorithms
   • should allow a programmer to write it in any language
   • key words written in capital letter

7. testing

   • Logical error
     • Human error with the construction of the algorithm
   • Run-time error
     • An error in the program eg stuck in a loop
   • syntax error
     • not a correct command for the coding language being used