Programing

Programing

1. Control Flow

   • Iteration
     • Loops
       • WHILE or FOR
   • Selection
     • IF THEN ELSE
   • Sequencing
     • The order through an algorithm

2. Algothms

   • Solving problems 1 step at a time
   • Processors can only process 1 instruction at a time
   • Mainly expressed as a flow chart
     • Make sure you know the symblos

3. Testing

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

4. Pseudocode

   • Used for planning algorithm
   • Should allow a programmer to write it in any language
   • Key words written in capital letter (eg INPUT, IF, WHILE)

5. Data types

   • Operations are mathematical symbols eg <> + -
   • Variable or constant
     • Variable changes during the program eg score in the game
     • Constant stays the same eg Pi
   • Arrays are lists of the same data types
   • Integers and real numbers
     • Integer is a whole number
     • Real (sometimes called float) can have decimal places

6. High level/ Low level programing

   • Low level is understood by rpocessor
     • Machine code
       • Binary codes for each instruction and register location
     • Assembly language
       • Codes specific to a type of processor
       • eg INP, LDA, OUt
   • High level has to be translated
     • Uses language that is easier to understand by humans
     • eg Python, BASIC, JAvascipt
     • Has to be translated

7. Translation

   • Interpreter
     • Would be used on open source software
     • Used when creating a program
     • Executes the course code directly
   • Compiler
     • Would be used for proprietary software
     • Once it is compiled it doesn't need the original source code
   • Assembler
     • Only can be used in low level programming
     • Turns assembly language into machine code