Texas Instruments Titanium TI-89 User Manual

Programming 592
An internal subroutine is called and executed in the same way as a separate program.
Ê
Declares the subroutine as a local variable.
Ë Defines the subroutine.
Ì Calls the subroutine.
Note:
Use the Program Editor’s † Var toolbar menu to enter the Define and
Prgm...EndPrgm commands.
Notes about Using Subroutines
Notes about Using SubroutinesNotes about Using Subroutines
Notes about Using Subroutines
At the end of a subroutine, execution returns to the calling program. To exit a subroutine
at any other time, use the
Return command.
A subroutine cannot access local variables declared in the calling program. Likewise, the
calling program cannot access local variables declared in a subroutine.
Ê
Ë
©
Ë
Ì
:subtest1()
:Prgm
:local subtest2
:Define subtest2(x,y)=Prgm
: Disp x,y
:EndPrgm
:¦Beginning of main program
:For i,1,4,1
: subtest2(i,I*1000)
:EndFor
:EndPrgm

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)