Monday, August 27, 2018

HP 12C Platinum and DM 41L: Rounding Numbers


HP 12C Platinum and DM 41L:  Rounding Numbers

Introduction

The following programs will round any positive number to any number of decimal places, regardless of your fix/float settings.  The formula for rounding x to n decimal places:

int(10^n * x + 0.5) / 10^n

HP 12C Platinum Program (also for HP 12C): Rounding a positive number

Step
Key Code
Key

001
1
1

002
0
0

003
34
x<>y

004
21
y^x

005
20
*

006
43, 40
LST x
For HP 12C regular: the code is 43, 36
007
34
x<>y

008
48
.

009
5
5

010
40
+

011
43, 25
ITNG

012
34
x<>y

013
10
÷

014
43, 33, 000
GTO 000


DM 41L (also for HP 41C) Program ROUND: Rounding a positive number

01 LBL ROUND
02 10^X
03 *
04 LASTx
05 x<>y
06 .5
07 +
08 INT
09 x<>y
10 /
11 RTN

Examples

Instructions:  Enter x, press [ENTER], enter n, execute the program

x
n
Result
0.83
1
0.8
8.21365
4
8.2137
170561.7737
0
170562
π
4
3.1416

Source:

Keith Oldham, Jan Myland, and Jerome Spanier  An Atlas of Functions Second Edition,  Springer.  2009 ISBN 978-0-387-48806-6

Eddie

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