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Procedures and Functions (Procedure (Procedure code can be saved and re…

- - - - A declaration part
        
        To activate a procedure it must get a call from the main program
      - An action part
      - A heading
- - - - A declaration part
      - A heading
      - An action part
  - - - Round
        
        Rounds a number to a certain number of decimal places
      - Random
        
        Generates a random number
      - Length
        
        Works out the length of a string
- - - - For a local variable the scope is limited to a single procedure or function
      - The scope means where the variable is visible in the program
      - For a global variable is visible throughout the whole program. This means the scope is the whole program
  - - - They cannot be accessed or assigned a value except or within that subroutine
    - - It prevents them from having their contents accidentally changed
      - The same variable name can be used more than once in different parts of the program
      - It prevents them from being used elsewhere in the program
      - They aid modularity of a program
    - - Common data required to pass repeatedly as data sharing is not possible between modules
      - They have a very limited scope
      - The debugging process of a local variable is tricky