Texas Instruments TITANIUM TI-89 User Manual

Page 608

Programming

608

Note:

EndIf

marks the end of the

Then

block that is executed if the condition is true.

If...Then...Else... EndIf Structures

To execute one group of commands if a conditional test is true and a different group if
the condition is false, use this structure:

Executed only if x>5.

Executed only if x

{

Displays value of:

• 2x if x>5
• 5x if x

{

If...Then...ElseIf... EndIf Structures

A more complex form of the If command lets you test a series of conditions. Suppose
your program prompts the user for a number that corresponds to one of four options. To
test for each option (

If Choice=1

If Choice = 2

, etc.), use the

If...Then...ElseIf...EndIf

structure.

:If x>5 Then

: Disp "x is greater than 5"

: 2

†

:Else

: Disp "x is less than or

equal to 5"

: 5

†

:EndIf

:Disp x