Texas Instruments TI-89 사용자 설명서

Programming

 598

Example of a Local Variable

Example of a Local Variable

Example of a Local Variable

Example of a Local Variable

The following program segment shows a 

 (which is discussed later in 

this module). The variable 

 is the loop counter. In most cases, the variable 

 is used only 

while the program is running.

Ê

 Declares variable i as local.

 As often as possible, use local variables for any variable that is used only within a 

program and does not need to be stored after the program stops.

If you declare variable 

 as local, it is deleted automatically when the program stops so 

that it does not use up memory.

What Causes an Undefined Variable Error Message?

What Causes an Undefined Variable Error Message?

What Causes an Undefined Variable Error Message?

What Causes an Undefined Variable Error Message?

An 

 variable error message displays when you evaluate a user-defined 

function or run a user-defined program that references a local variable that is not 
initialized (assigned a value). 

This example is a multi-statement function, rather than a program. Line breaks are 
shown here, but you would type the text in the entry line as one continuous line, such as: 

 where the ellipsis indicates the entry line text continues off-

screen.

Ê

:Local I

:For i,0,5,1

:  Disp I

:EndFor

:Disp i