unit 7

unit 7

1. Arrays

   • An array is a data structure that allows you hold several variables at once, all same type and name

2. Iteration

   • Iteration means to repeat.
   • The three types of iteration statements are for...next/while...endwhile/do...until (in some languages eg python do until will not work)
     • for...next should be used if you want to execute something in a loop a specific amount of times
     • Use while...endwhile when you want to execute the loop while a certain condition is true

3. machine code

   • machine code is written in binary
   • each instruction only performed one small task
   • writing code was difficult and time consuming