HP HP-28S User Manual

User Functions for Unit Conversion
If you perform particular unit conversions often, you can write user
functions for those conversions. In this section you'll write user func-
tions O-C and C-O that convert between ounces and grams; since
they're user functions, you can use them in either RPN or algebraic
syntax.
Recall
that user functions must fulfill two requirements:
•
They must explicitly indicate their arguments .
•
They must return exactly one result.
First write
O-C.
Begin the program and indicate the argument.
~---------=~~~~~===
0.G ~ x 2: 74.8051948052
1: 'gal'
The right arrow indicates that the following name is a local variable,
which will exist only within this program.
Define the conversion.
o x ['] oz ['] ['] 9 ['] .1 CONVERT I
I
DROP II ENTER I
2: 'gal'
1: « -1- x « x 'oz' , 9 ,
CONVERT DROP » »
mDlIiDIRHlrnHDDDlID
The closing delimiters are added for you.
This
program means: take an argument from the stack (in RPN syn-
tax) or from the expression (in algebraic syntax) and call it x; convert x
from ounces to grams; and drop the gram unit from the stack.
Store
the program in a variable O-C.
~----------------------~
['] o.G G ISTOI 3:
2: 74.8051948052
1 : 'gal'
mDlIiDIRHlrnHDDDlID
14: Unit Conversion 147
I

HP HP-28S Specifications

General

Brand	HP
Model	HP-28S
Category	Calculator
Language	English