SUB

PET VIC-20 C64 C16 Plus/4 C128 X16 M65

The SUB keyword starts a subroutine block.

SUB <name> ([<arg> AS <type>[, <arg> AS <type>]...]) [OVERLOAD] [PRIVATE|SHARED] [STATIC]
  <statements>
END SUB

• <name> must be a valid identifer
• The argument list is optional, but the parenthesis () must be included
• The OVERLOAD keyword must be given if the function overloads another function with the same name
• If the subroutine is defined in a TYPE block, the PRIVATE keyword indicates that the subroutine may only be called from within that TYPE block.
• The SHARED keyword indicates that the function is visible from within other code modules
• The STATIC keyword indicates that no stack frame is allocated on each subroutine call. See static_vs_dynamic

• Subroutines
• Functions