BBC BASIC Programmers' Reference

User Tools

Site Tools

Trace: • changing_20the_20mdi_20background_20colour • hiding_20a_20window_20from_20a_20screenshot • capturing_20the_20contents_20of_20a_20window
passing_20arrays_20to_20subs_20and_20functions

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision		Previous revision
passing_20arrays_20to_20subs_20and_20functions [2018/03/31 13:19] – external edit 127.0.0.1passing_20arrays_20to_20subs_20and_20functions [2024/01/05 00:22] (current) – external edit 127.0.0.1
Line 2: Line 2:
  
 //by Richard Russell, March 2014//\\ \\  LB Booster provides the capability of passing an entire array as a parameter to a SUB or a FUNCTION. Here is a simple example:\\  //by Richard Russell, March 2014//\\ \\  LB Booster provides the capability of passing an entire array as a parameter to a SUB or a FUNCTION. Here is a simple example:\\ 
 +<code lb>
       one(5) = 123       one(5) = 123
       call test one()       call test one()
Line 9: Line 10:
       print two(5)       print two(5)
   end sub   end sub
 +</code>
 To demonstrate that the array **two()** is genuinely 'local' to the SUB:\\  To demonstrate that the array **two()** is genuinely 'local' to the SUB:\\ 
 +<code lb>
       one(5) = 123       one(5) = 123
       two(5) = 456       two(5) = 456
Line 19: Line 22:
       print two(5)       print two(5)
   end sub   end sub
 +</code>
 Arrays are automatically passed 'by reference' (you don't need to specify BYREF):\\  Arrays are automatically passed 'by reference' (you don't need to specify BYREF):\\ 
 +<code lb>
       one(5) = 123       one(5) = 123
       two(5) = 456       two(5) = 456
Line 31: Line 36:
       two(5) = 789       two(5) = 789
   end sub   end sub
 +</code>
 But you **must** use BYREF if you want to REDIM the array inside the SUB (requires LBB v2.53 or later):\\  But you **must** use BYREF if you want to REDIM the array inside the SUB (requires LBB v2.53 or later):\\ 
 +<code lb>
       one(5) = 123       one(5) = 123
       two(5) = 456       two(5) = 456
Line 44: Line 51:
       two(15) = 789       two(15) = 789
   end sub   end sub
 +</code>
 Of course you can use a FUNCTION instead of a SUB:\\  Of course you can use a FUNCTION instead of a SUB:\\ 
 +<code lb>
       one(5) = 123       one(5) = 123
       two(5) = 456       two(5) = 456
Line 56: Line 65:
       two(5) = 789       two(5) = 789
   end function   end function
 +</code>
passing_20arrays_20to_20subs_20and_20functions.1522502372.txt.gz · Last modified: 2024/01/05 00:17 (external edit)