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H.1  Routines and Variable Scoping
Sheerpower provides a number of ways to organize your code. This becomes very important as your programs grow larger. Programs of over 800,000 lines of code have been written in Sheerpower. These, by the way, compile, link, and run within three seconds of saving a coding change.

A number of types of routines are provided by Sheerpower:
  • Global routines -- the default routine type; all variables are global to the program.
  • Private routines -- by default, all variables iniside the routine are private to the routine.
  • Scoped routines -- just like private routines except all variables are reset upon entry or exit.
  • Local routines -- acquire the scoping of the private routine that called them. Used for the rapid abstraction of large routines into a series of smaller routines.
Routine names must start with a letter, include at least one underscore "_", and can contain any number of other letters and digits. By default, all routines are global unless specified otherwise.

When talking about routines, we have to also talk about "variable scoping." Scoping determines which variables can be used and where. Variables outside of any routine are called global or main variables. From outside of a routine, they can be accessed using just their name. They can also be accessed from within a global routine the same way. However, from within a private routine, they must be accessed by prefixing their name with MAIN$. We call this their fully-qualified name. For example:
x = 45 abc = 999 tax = 9876 routine do_it print x // this will print 45 print main$x // this will also print 45 end routine private routine here_we_go x = 101 print x // this will print 101 print main$x // this will print 45 end routine my_private my_regular private routine my_private abc=123 local do_it_local end routine local routine do_it_local xyz$ = 'is xyz' assert abc=123 assert xyz$='is xyz' end routine routine my_regular: private abc, tax abc = 456 tax = 99 local do_it_2 print 'In '; _routine debug show abc, my_regular$abc, main$abc, tax, my_regular$tax end routine local routine do_it_2 my_tax = 45 end routine
The fully qualified name of the variable "x" in the here_we_go private routine is here_we_go$x. Using this prefix method is how Sheerpower keeps track of the scope of variables. It also allows the compiler to assign the adddresses of all variables at compile-time -- speeding up runtime performance. In addition, it makes it easier for programmers to keep track of the scoping of variables at a glance.

Sheerpower also supports include directives and modules.

Note: Sheerpower supports recursive routines through the use of memorization techniques. Avoiding traditional recursion gives Sheerpower a significant performance boost -- no data stack to build or tear down. It also makes hacking Sheerpower code virtually impossible using traditional hacking methods.

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