Programming.

Programming.

1. Algorithms.

   • Solve problems 1 step at a time.
   • Processors can only process 1 instruction at once.
   • Flowcharts.
     • Symbols.
   • Psuedocode.
     • Allows program to be written in any language.
     • Keywords in capitals. eg INPUT.

2. High/Low level.

   • Low level.
     • Understood by processor.
     • Machine code.
       • Binary.
     • Assembly language.
       • Codes to a specific type of processor.
       • Writes as each instruction would be processed.
       • INP, LDA, OUT.
   • High level.
     • Translate.
     • Easier to write.
     • Easier to understand.
     • Python, JavaScript.

3. Translation.

   • Assembler.
     • Turns assembly language to machine code.
     • Low level language.
   • Compiler.
     • Creates an executable file.
     • High level language.
     • Doesn't need original source code after it's complied.
     • Used for propriety software.
   • Interpreter.
     • Executes source code directly.
     • Used when creating program.
     • Used for open source software.
     • High level language.

4. Control flow.

   • Sequence.
     • Order of program.
   • Selection.
     • IF THEN ELSE.
   • Iteration.
     • WHILE, FOR.

5. Data types.

   • Variable.
     • Changes during program.
   • Constant.
     • Stays the same.
   • Integers
     • Whole number.
   • Real number.
     • Float.
   • Array.
     • List of the same data type.

6. Testing.

   • Logical error.
     • Human error in algorithm.
   • Run-time error.
     • Error in program eg. stuck in loop.
   • Syntax error.
     • Not a correct command for coding language used.