Texas Instruments TI-89 Manuel D’Utilisation

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Creating a Multi-Statement Function

Creating a Multi-Statement Function

Creating a Multi-Statement Function

Creating a Multi-Statement Function

You can also create a user-defined function whose definition consists of multiple 
statements. The definition can include many of the control and decision-making 
structures (

, 

, 

, etc.) used in programming.

 For information about similarities and differences between functions and 

programs, refer to Programming.

For example, suppose you want to create a function that sums a series of reciprocals 
based on an entered integer (

):

When creating the definition of a multi-statement function, it may be helpful to visualize it 
first in a block form.

Ê

Func and EndFunc must begin and end the function.

Ë

Variables not in the argument list must be declared as local.

Ê

Ë

Ì

Í

Î

Ê

Func

Local temp,i

If fPart(nn)

ƒ

0 or nn

{

0

  Return “bad argument”

0

!

temp

For i,nn,1,

M

1

  approx(temp+1/i)

!

temp

EndFor

Return temp

EndFunc 

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n

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1

n 1

–

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