Texas Instruments Titanium TI-89 User Manual

Programming 608
Note: EndIf marks the end of the Then block that is executed if the condition is true.
If...Then...Else... EndIf Structures
If...Then...Else... EndIf StructuresIf...Then...Else... EndIf Structures
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:
Ê
Executed only if x>5.
Ë Executed only if x{5.
Ì Displays value of:
• 2x if x>5
• 5x if x
{5
If...Then...ElseIf... EndIf Structures
If...Then...ElseIf... EndIf StructuresIf...Then...ElseIf... EndIf Structures
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.
Ê
Ê
Ë
Ë
Ì
:If x>5 Then
: Disp "x is greater than 5"
: 2†x!x
:Else
: Disp "x is less than or
equal to 5"
: 5†x!x
:EndIf
:Disp x

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)