Texas Instruments TITANIUM TI-89 User Manual

Page 582

Programming

582

•

Control structures such as

If...EndIf

commands use a conditional test to decide

which part of a program to execute.

•

Loops commands such as

For...EndFor

repeat a group of commands.

Using Indentation

Displaying Calculated Results

In a program, calculated results are not displayed unless you use an output command.
This is an important difference between performing a calculation on the Home screen
and in a program.

For more complex programs that
use

If...EndIf

and loop structures

such as

For...EndFor

, you can make

the programs easier to read and
understand by using indentation.

:If x>5 Then

: Disp "x is > 5"

:Else

: Disp "x is < or = 5"

:EndIf

These calculations will not
display a result in a program
(although they will on the Home
screen).

:12

:cos(

/4)

:solve(x^2–x–2=0,x)

Output commands such as

Disp

will display a result in a program.

:Disp 12

:Disp cos(

/4)

:Disp solve(x^2–x–2=0,x)