Texas Instruments TITANIUM TI-89 - Manual (Page 591)

Programming 591
Calling a Separate Program Calling a Separate Program Calling a Separate Program Calling a Separate Program
To call a separate program, use the same syntax used to run the program from the
Home screen.
Calling an Internal Subroutine Calling an Internal Subroutine Calling an Internal Subroutine Calling an Internal Subroutine
To define an internal subroutine, use the Define command with Prgm...EndPrgm .
Because a subroutine must be defined before it can be called, it is a good practice to
define subroutines at the beginning of the main program.
:subtest1()
:Prgm
:For i,1,4,1
: subtest2(i,i
ù
1000)
:EndFor
:EndPrgm
:subtest2(x,y)
:Prgm
: Disp x,y
:EndPrgm