Texas Instruments Titanium TI-89, User Manual

Page: 572 / 977

Programming 569
Example of Passing Values to a Program
The following program draws a circle on the Graph screen and then draws a horizontal
line across the top of the circle. Three values must be passed to the program: x and y
coordinates for the circle’s center and the radius r.
• When you write the program in the Program Editor:
Note:
In this example, you cannot use circle as the program name because it
conflicts with a command name.
Before drawing the circle, the program turns off any selected Y= Editor functions,
displays a standard viewing window, and “squares” the window.
In the ( ) beside the program name,
specify the variables that will be
used to store the passed values.
Notice that the program also
contains commands that set up the
Graph screen.
:circ(x,y,r)
Ê
:
Prgm
:FnOff
:ZoomStd
:ZoomSqr
:Circle x,y,r
:LineHorz y+r
:EndPrgm
Ê
Only circ( ) is initially
displayed on the blank
template; be sure to edit this
line.