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variabe and contact (Internal memory (memory location (Selecting a Data…

- - - - Input
      -  Processing
      -  output
    - - data type // name/// also called identifier
      - rules
        
        begin with a letter
        
         No punctuation marks
        
        spaces or other characters (such
        as $ or %)
        
        cannot be a keyword
    - - can store a number, text,
        date or a Boolean value (true or false)
      - Data types - control the type of data the memory location can store
        
         Fundamental data types - basic data types built
        
        into the C++ language which must be typed using
        
        lowercase letters
        
         Integers - whole numbers
      - Fundamental data types
        
        char
        
        A,a,&, *,+,&,0
        
        Floating-point
        
         Float
        
         Double
        
         Long double
  - - - assign a
      - name, data type and (optionally) an initial value to
      - the location
    - - change (vary) during runtime,
    - - cannot be changed during runtime.
      - error message IF WANT TO CHANGEDURING RUNTIME
      - Advantages of using named constant
        
        program more self-documenting and easier to
        modify
        
        easier and less prone to
        typing errors EG TYPE ‘PI’ rather than 3.141593
- - - - data type of the expression does not match that
      - of the memory location, the data is converted
      - appropriately
      -  Converts values to fit memory locations