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computing :computer: (procedures (functions (random: generates a random…

- - - - Local variables are created when the subroutine is called and are then destroyed when the subroutine terminates.
        
        They can only be accessed or assigned a value within that subroutine.
        
        advantages
        
        It prevents them from being used elsewhere in the program
        
        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
        
        They aid modularity of a program
  - - - their values may accidentally change if the programmer forgets that they have already used them in another subroutine.
- - - - pass by reference when a value is going to change in the subroutine when it is passed in.