BASIC Programs on HP 50G

[Han]

(03-27-2014 08:05 AM)Alvaro Wrote:  Second, I am talking about Local variable Structure; please read page 3-303 (PDF 423) of the Advanced User Guide HP 50g, about (Create Local). A Local Variable must be followed either by a Expression or a Program. If you don´t proceed like that, you must use the Global Variable definition! And, inside a Program, every time you define a Local Variable it must be followed either by a Expression or a Program and repeat that so many times as you need to "pause" for variable input.
Regarding the Disadvantage of Global Variables , please read page 1-7 (PDF 31) "Using Local Variables".
And, if I am missing something or you know it better, then it would be much more usefull to share your knowledge, if you like.

This is true if you absolutely must create a new local variable deep within the program as opposed to declaring them at the start. If your program has a fixed number of variables, then you can always create the ALL variables ahead of time and initiate them with a dummy value:

Code:


<<
  0 0 0 0 0 -> a b c d e 
  <<
  @ now you are free to use a b c d and e as you like
  >>
>>

I cannot think of very many instances in which a completed program would require an indeterminate number of variables during run time. Even so, however, your programs would necessarily have a finite number of variables (if for no other reason than there is only a finite amount of memory). So you can always "pre" declare variables (for use much later on) rather than waiting until you need them to create them.