2-2-1

2-2-1

1. Numbers are not just numbers

   • counting apples in school
   • adding numbers because we want to know something

2. Maths introduce "variables"

   • x = y + 2
   • x and y can be viewed as containers or references to the actual number

3. Computer programs uses variables heavily

   • many numbers in programs
   • we need to be able to refer to them using names that make sense to us

4. Let's have a look at how we do that in code

   • 5 variables exist
   • private is an advanced feature
     • always use it here
     • relates to OOP
       • after the course you should look at that
   • float tells us what kind of data the variable contain / refer to
   • name = value;
   • More advanced variable point to a bitmap
     • indicate advanced features
   • show in debugger debugger
     • set break point
     • show effect of click

5. Many types exist

   • boolean
   • integer
   • string