Programming

Programming

1. Translation

   • Assembler
     • Assembly language into machine code
   • Complier
     • Creates a executable file to run the program
     • when complied it does'nt need the original source code
   • Interpreter
     • Execute the source code directly
     • Would be used on open source sfotware

2. Control flow

   • Sequence
     • Order
   • Selection
     • IF statements
   • Iteration
     • Loops

3. High level/low level programming

   • High level has to be translated
     • e.g. Python
     • Uses language that is easier to understand by humans
     • Has to be translated
   • Low level is understood by the processor
     • Assembly language
       • Codes specific to a type of processor
         • e.g. INP, LDA, OUT
       • Written as each instruction and register location
     • Machine code
       • Binary codes for each instruction and register location

4. Algorithm

   • Solving a problem 1 step at a time
   • Processors can only process 1 instrucution at a time
   • Mainly expressed as a flow chart
     • Need to know the shapes

5. Pseudocode

   • Used for planning alrgorithm
   • Should allow a programmer to write in any language
   • Key words written in capital letters e.g. INPUT, IF, WHILE

6. Data type

   • Operations are mathematical symbols e.g. < > + -
   • Variable or constant
     • Variable changes during the program e.g. score in a game
     • Constant stays the same e.g. Pi
   • Arrays are lists of the same data types
   • Integers and real numbers
     • integer is a whole number

7. Testing

   • Logical error
     • User mistake
   • Run-time error
     • User unefficiant coding so it may crash/ have a bug
   • Syntax error
     • All program have different language or have a different rule (not a correct language being used)

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