Unit 2.2

Unit 2.2

1. Variables and Constants

   • Both are used to store data whilst the program is running
   • Variables are able to be changed, a constant's value cannot change

2. Algorithms

   • word = input ("Enter a word")
     • count = 0
       • while count < 3
         • for x = 1 to word.length
           • if x.upper = "A" then
             • count = count + 1
               • endif
                 • next x
                   • endwhile
   • endwhile
     • x = x + 1
       • print b * x
         • while x < = 10
           • x = 1
             • input b
   • next x
     • print("Happy birthday")
       • for x = 1 to age
         • input age
   • open allsessions.txt
     • for apprend
       • write trainingdata
         • close file
   • where venuedetails = "Bycars Park"
     • print trainingdata
   • Select Songtitle + Length
     • From song
       • Where bandname ="Penguin Steak"

3. Data Types

   • Integer
     • E.g. 1 or 2 or 3
   • String
     • E.g. Bycars Park
   • Boolean
     • E.g. True or False
   • Real/Float
     • E.g. 12.7 or 15.2
   • Casting
     • Changing how a variable's data type is interpreted

4. 2D Array

   • Has rows and columns
   • First index
     • Can hold data for one training session
   • Second index
     • Can hold data for other training sessions

5. Database record

   • Collection of data for a certain entity