Texas Instruments TITANIUM TI-89 - Manual (Page 225)

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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 (
If , ElseIf , Return , etc.) used in programming.
Note: 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 (
n ):
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.
К
Л
М
Н
О
К
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
1
n
---
1
n 1 –
------------ ... 1
1
--- + + +