10 rem Function definition

20 rem ** 1. Function defined as formula. An obsolete way - does not work properly with integer formal parameters (e.g. x%).
30 def fnmultiply(a, b) = a * b

40 rem ** Call the functions
50 print multiply(3,1.23456)
60 print fn multiply(3,1.23456)
70 end

200 rem ** 2. Function defined as subroutine returning a value
210 sub multiply(a,b)
220   multiply = a*b
230 end sub