AS F452

AS F452

1. Data types and Data structures

   • Data types
     • int
       • 2 to 4 bytes
       • Full numbers
     • real
       • 4 to 8 bytes
       • Decimal numbers
     • char
       • 1 byte
       • Single characters
     • String
       • 1 byte per char
       • Numbers and letters under one identifier
     • Boolean
       • rounded to 1 byte
       • TRUE or FALSE
   • Data structures
     • Array
       • 1d, 2d or 3d
       • Uses an index
       • Same data type
     • Record
       • Different data types

2. The structure of procedural programs

3. Common facilities of procedural programs

4. Writing maintainable programs

   • Variable
     • Local
       • Decalred
     • Global
     • Scope
     • Initialise a variable
   • Constant
   • Indentifier
   • Keyword
   • Techniques for writing maintainable code
     • Commenting
       • Adding comments to code
       • Allows others to be able to understand it
     • Meaningful identifier
       • Using an identifier which explains what the variable does
       • Others can understand what a variable does
     • Indenting
       • Keep code in loops together and indented forwards to show what is in a loop
       • Makes it easier to see what is contained within a loop, and what should be treated together